39988903940 has 12 divisors (see below), whose sum is σ = 83976698316. Its totient is φ = 15995561568.

The previous prime is 39988903891. The next prime is 39988903943. The reversal of 39988903940 is 4930988993.

It can be written as a sum of positive squares in 2 ways, for example, as 6373148224 + 33615755716 = 79832^2 + 183346^2 .

It is a super-2 number, since 2×39988903940² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39988903943) 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, 999722579 + ... + 999722618.

It is an arithmetic number, because the mean of its divisors is an integer number (6998058193).

Almost surely, 2^39988903940 is an apocalyptic number.

It is an amenable number.

39988903940 is an abundant number, since it is smaller than the sum of its proper divisors (43987794376).

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

39988903940 is a wasteful number, since it uses less digits than its factorization.

39988903940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999445206 (or 1999445204 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 62.

The spelling of 39988903940 in words is "thirty-nine billion, nine hundred eighty-eight million, nine hundred three thousand, nine hundred forty".