39129569640 has 128 divisors (see below), whose sum is σ = 149065056000. Its totient is φ = 8943899904.

The previous prime is 39129569623. The next prime is 39129569641. The reversal of 39129569640 is 4696592193.

39129569640 is a `hidden beast` number, since 3 + 9 + 12 + 9 + 569 + 64 + 0 = 666.

It is a super-2 number, since 2×39129569640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (39129569641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2580375 + ... + 2595494.

It is an arithmetic number, because the mean of its divisors is an integer number (1164570750).

Almost surely, 2^39129569640 is an apocalyptic number.

39129569640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39129569640 is an abundant number, since it is smaller than the sum of its proper divisors (109935486360).

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

39129569640 is a wasteful number, since it uses less digits than its factorization.

39129569640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175896 (or 5175886 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The spelling of 39129569640 in words is "thirty-nine billion, one hundred twenty-nine million, five hundred sixty-nine thousand, six hundred forty".