38457921 has 8 divisors (see below), whose sum is σ = 51391264. Its totient is φ = 25581600.

The previous prime is 38457901. The next prime is 38457977. The reversal of 38457921 is 12975483.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38457921 - 2⁵ = 38457889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38457921.

It is not an unprimeable number, because it can be changed into a prime (38457901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12655 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (6423908).

Almost surely, 2^38457921 is an apocalyptic number.

It is an amenable number.

38457921 is a deficient number, since it is larger than the sum of its proper divisors (12933343).

38457921 is a wasteful number, since it uses less digits than its factorization.

38457921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28511.

The product of its digits is 60480, while the sum is 39.

The square root of 38457921 is about 6201.4450735292. The cubic root of 38457921 is about 337.5426075152.

The spelling of 38457921 in words is "thirty-eight million, four hundred fifty-seven thousand, nine hundred twenty-one".