39556381940 has 24 divisors (see below), whose sum is σ = 84238382592. Its totient is φ = 15599699360.

The previous prime is 39556381933. The next prime is 39556381967. The reversal of 39556381940 is 4918365593.

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, 13926884 + ... + 13929723.

It is an arithmetic number, because the mean of its divisors is an integer number (3509932608).

Almost surely, 2^39556381940 is an apocalyptic number.

It is an amenable number.

39556381940 is an abundant number, since it is smaller than the sum of its proper divisors (44682000652).

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

39556381940 is a wasteful number, since it uses less digits than its factorization.

39556381940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27856687 (or 27856685 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 53.

The spelling of 39556381940 in words is "thirty-nine billion, five hundred fifty-six million, three hundred eighty-one thousand, nine hundred forty".