38639805940 has 12 divisors (see below), whose sum is σ = 81143592516. Its totient is φ = 15455922368.

The previous prime is 38639805847. The next prime is 38639805961. The reversal of 38639805940 is 4950893683.

It can be written as a sum of positive squares in 2 ways, for example, as 23664899556 + 14974906384 = 153834^2 + 122372^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965995129 + ... + 965995168.

It is an arithmetic number, because the mean of its divisors is an integer number (6761966043).

Almost surely, 2^38639805940 is an apocalyptic number.

It is an amenable number.

38639805940 is an abundant number, since it is smaller than the sum of its proper divisors (42503786576).

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

38639805940 is a wasteful number, since it uses less digits than its factorization.

38639805940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931990306 (or 1931990304 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 38639805940 in words is "thirty-eight billion, six hundred thirty-nine million, eight hundred five thousand, nine hundred forty".