38921407 has 16 divisors (see below), whose sum is σ = 45821952. Its totient is φ = 32366880.

The previous prime is 38921401. The next prime is 38921429. The reversal of 38921407 is 70412983.

It is a de Polignac number, because none of the positive numbers 2^k-38921407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38921401) 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, 57153 + ... + 57829.

It is an arithmetic number, because the mean of its divisors is an integer number (2863872).

Almost surely, 2^38921407 is an apocalyptic number.

38921407 is a deficient number, since it is larger than the sum of its proper divisors (6900545).

38921407 is a wasteful number, since it uses less digits than its factorization.

38921407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 38921407 is about 6238.7023490466. The cubic root of 38921407 is about 338.8931915526.

The spelling of 38921407 in words is "thirty-eight million, nine hundred twenty-one thousand, four hundred seven".