38909255921 has 6 divisors (see below), whose sum is σ = 39498663330. Its totient is φ = 38328516336.

The previous prime is 38909255911. The next prime is 38909255927. The reversal of 38909255921 is 12955290983.

It can be written as a sum of positive squares in only one way, i.e., 25427491600 + 13481764321 = 159460^2 + 116111^2 .

It is a de Polignac number, because none of the positive numbers 2^k-38909255921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38909255927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4329356 + ... + 4338333.

It is an arithmetic number, because the mean of its divisors is an integer number (6583110555).

Almost surely, 2^38909255921 is an apocalyptic number.

It is an amenable number.

38909255921 is a deficient number, since it is larger than the sum of its proper divisors (589407409).

38909255921 is an frugal number, since it uses more digits than its factorization.

38909255921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8667823 (or 8667756 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 53.

The spelling of 38909255921 in words is "thirty-eight billion, nine hundred nine million, two hundred fifty-five thousand, nine hundred twenty-one".