39940728 has 32 divisors (see below), whose sum is σ = 100008960. Its totient is φ = 13292640.

The previous prime is 39940711. The next prime is 39940751. The reversal of 39940728 is 82704993.

It is a self number, because there is not a number n which added to its sum of digits gives 39940728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25323 + ... + 26853.

It is an arithmetic number, because the mean of its divisors is an integer number (3125280).

Almost surely, 2^39940728 is an apocalyptic number.

It is an amenable number.

39940728 is an abundant number, since it is smaller than the sum of its proper divisors (60068232).

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

39940728 is a wasteful number, since it uses less digits than its factorization.

39940728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627 (or 2623 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 39940728 is about 6319.8677201347. The cubic root of 39940728 is about 341.8261830061.

The spelling of 39940728 in words is "thirty-nine million, nine hundred forty thousand, seven hundred twenty-eight".