39640872 has 32 divisors (see below), whose sum is σ = 104932800. Its totient is φ = 12436224.

The previous prime is 39640837. The next prime is 39640879. The reversal of 39640872 is 27804693.

It is a self number, because there is not a number n which added to its sum of digits gives 39640872.

It is not an unprimeable number, because it can be changed into a prime (39640879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48172 + ... + 48987.

It is an arithmetic number, because the mean of its divisors is an integer number (3279150).

Almost surely, 2^39640872 is an apocalyptic number.

It is an amenable number.

39640872 is an abundant number, since it is smaller than the sum of its proper divisors (65291928).

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

39640872 is a wasteful number, since it uses less digits than its factorization.

39640872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97185 (or 97181 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 39640872 is about 6296.0997450803. The cubic root of 39640872 is about 340.9686104983.

The spelling of 39640872 in words is "thirty-nine million, six hundred forty thousand, eight hundred seventy-two".