57138839 has 2 divisors, whose sum is σ = 57138840. Its totient is φ = 57138838.

The previous prime is 57138827. The next prime is 57138847. The reversal of 57138839 is 93883175.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57138839 - 2²⁴ = 40361623 is a prime.

It is a super-3 number, since 3×57138839³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 57138839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57138899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28569419 + 28569420.

It is an arithmetic number, because the mean of its divisors is an integer number (28569420).

Almost surely, 2^57138839 is an apocalyptic number.

57138839 is a deficient number, since it is larger than the sum of its proper divisors (1).

57138839 is an equidigital number, since it uses as much as digits as its factorization.

57138839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 57138839 is about 7559.0236803439. The cubic root of 57138839 is about 385.1623288036.

The spelling of 57138839 in words is "fifty-seven million, one hundred thirty-eight thousand, eight hundred thirty-nine".