38902121 has 4 divisors (see below), whose sum is σ = 38957700. Its totient is φ = 38846544.

The previous prime is 38902111. The next prime is 38902147. The reversal of 38902121 is 12120983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4515625 + 34386496 = 2125^2 + 5864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38902121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38902111) 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, 26726 + ... + 28143.

It is an arithmetic number, because the mean of its divisors is an integer number (9739425).

Almost surely, 2^38902121 is an apocalyptic number.

It is an amenable number.

38902121 is a deficient number, since it is larger than the sum of its proper divisors (55579).

38902121 is an equidigital number, since it uses as much as digits as its factorization.

38902121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55578.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 38902121 is about 6237.1564835268. The cubic root of 38902121 is about 338.8372071605.

The spelling of 38902121 in words is "thirty-eight million, nine hundred two thousand, one hundred twenty-one".