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139784240 = 2451747303
BaseRepresentation
bin10000101010011…
…11000000110000
3100202000202221002
420111033000300
5241241043430
621512021132
73315101141
oct1025170060
9322022832
10139784240
11719a4a72
123a9917a8
1322c6308b
14147c9ac8
15c412845
hex854f030

139784240 has 20 divisors (see below), whose sum is σ = 324998544. Its totient is φ = 55913664.

The previous prime is 139784233. The next prime is 139784243. The reversal of 139784240 is 42487931.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 139784194 and 139784203.

It is not an unprimeable number, because it can be changed into a prime (139784243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873572 + ... + 873731.

Almost surely, 2139784240 is an apocalyptic number.

139784240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139784240 is an abundant number, since it is smaller than the sum of its proper divisors (185214304).

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

139784240 is a wasteful number, since it uses less digits than its factorization.

139784240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747316 (or 1747310 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 139784240 is about 11823.0385265379. The cubic root of 139784240 is about 518.9825271967.

The spelling of 139784240 in words is "one hundred thirty-nine million, seven hundred eighty-four thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 16 20 40 80 1747303 3494606 6989212 8736515 13978424 17473030 27956848 34946060 69892120 139784240