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1387540 = 2257111753
BaseRepresentation
bin101010010110000010100
32121111100101
411102300110
5323400130
645423444
714536210
oct5226024
92544311
101387540
11868530
1256ab84
1339773b
14281940
151c61ca
hex152c14

1387540 has 96 divisors (see below), whose sum is σ = 3919104. Its totient is φ = 399360.

The previous prime is 1387531. The next prime is 1387571. The reversal of 1387540 is 457831.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1387499 and 1387508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26154 + ... + 26206.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

21387540 is an apocalyptic number.

1387540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1959552).

1387540 is an abundant number, since it is smaller than the sum of its proper divisors (2531564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1387540 is a wasteful number, since it uses less digits than its factorization.

1387540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1387540 is about 1177.9388778710. The cubic root of 1387540 is about 111.5360270209.

The spelling of 1387540 in words is "one million, three hundred eighty-seven thousand, five hundred forty".

Divisors: 1 2 4 5 7 10 11 14 17 20 22 28 34 35 44 53 55 68 70 77 85 106 110 119 140 154 170 187 212 220 238 265 308 340 371 374 385 476 530 583 595 742 748 770 901 935 1060 1166 1190 1309 1484 1540 1802 1855 1870 2332 2380 2618 2915 3604 3710 3740 4081 4505 5236 5830 6307 6545 7420 8162 9010 9911 11660 12614 13090 16324 18020 19822 20405 25228 26180 31535 39644 40810 49555 63070 69377 81620 99110 126140 138754 198220 277508 346885 693770 1387540