38757921 has 16 divisors (see below), whose sum is σ = 55182336. Its totient is φ = 24138576.

The previous prime is 38757881. The next prime is 38757923. The reversal of 38757921 is 12975783.

It is not a de Polignac number, because 38757921 - 2⁶ = 38757857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38757923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3565 + ... + 9498.

It is an arithmetic number, because the mean of its divisors is an integer number (3448896).

Almost surely, 2^38757921 is an apocalyptic number.

It is an amenable number.

38757921 is a deficient number, since it is larger than the sum of its proper divisors (16424415).

38757921 is a wasteful number, since it uses less digits than its factorization.

38757921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13132.

The product of its digits is 105840, while the sum is 42.

The square root of 38757921 is about 6225.5859965147. The cubic root of 38757921 is about 338.4180284674.

The spelling of 38757921 in words is "thirty-eight million, seven hundred fifty-seven thousand, nine hundred twenty-one".