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2491830 = 233511839
BaseRepresentation
bin1001100000010110110110
311200121011000
421200112312
51114214310
6125224130
730115545
oct11402666
94617130
102491830
111452170
12a02046
13693273
1448c15c
153434c0
hex2605b6

2491830 has 64 divisors (see below), whose sum is σ = 7257600. Its totient is φ = 603360.

The previous prime is 2491829. The next prime is 2491837. The reversal of 2491830 is 381942.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 2491794 and 2491803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2551 + ... + 3389.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

22491830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2491830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3628800).

2491830 is an abundant number, since it is smaller than the sum of its proper divisors (4765770).

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

2491830 is a wasteful number, since it uses less digits than its factorization.

2491830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2491830 is about 1578.5531349942. The cubic root of 2491830 is about 135.5728742044.

It can be divided in two parts, 2491 and 830, that added together give a triangular number (3321 = T81).

The spelling of 2491830 in words is "two million, four hundred ninety-one thousand, eight hundred thirty".

Divisors: 1 2 3 5 6 9 10 11 15 18 22 27 30 33 45 54 55 66 90 99 110 135 165 198 270 297 330 495 594 839 990 1485 1678 2517 2970 4195 5034 7551 8390 9229 12585 15102 18458 22653 25170 27687 37755 45306 46145 55374 75510 83061 92290 113265 138435 166122 226530 249183 276870 415305 498366 830610 1245915 2491830