57438021 has 4 divisors (see below), whose sum is σ = 76584032. Its totient is φ = 38292012.

The previous prime is 57437987. The next prime is 57438047. The reversal of 57438021 is 12083475.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 57438021 - 2¹³ = 57429829 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 57438021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57438091) 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, 9573001 + ... + 9573006.

It is an arithmetic number, because the mean of its divisors is an integer number (19146008).

Almost surely, 2^57438021 is an apocalyptic number.

It is an amenable number.

57438021 is a deficient number, since it is larger than the sum of its proper divisors (19146011).

57438021 is a wasteful number, since it uses less digits than its factorization.

57438021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19146010.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 57438021 is about 7578.7875679425. The cubic root of 57438021 is about 385.8334023835.

The spelling of 57438021 in words is "fifty-seven million, four hundred thirty-eight thousand, twenty-one".