57438421 has 2 divisors, whose sum is σ = 57438422. Its totient is φ = 57438420.

The previous prime is 57438413. The next prime is 57438449. The reversal of 57438421 is 12483475.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 26635921 = 5550^2 + 5161^2 .

It is a cyclic number.

It is not a de Polignac number, because 57438421 - 2³ = 57438413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57430421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28719210 + 28719211.

It is an arithmetic number, because the mean of its divisors is an integer number (28719211).

Almost surely, 2^57438421 is an apocalyptic number.

It is an amenable number.

57438421 is a deficient number, since it is larger than the sum of its proper divisors (1).

57438421 is an equidigital number, since it uses as much as digits as its factorization.

57438421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 34.

The square root of 57438421 is about 7578.8139573419. The cubic root of 57438421 is about 385.8342980330.

The spelling of 57438421 in words is "fifty-seven million, four hundred thirty-eight thousand, four hundred twenty-one".