57138823 has 16 divisors (see below), whose sum is σ = 66920256. Its totient is φ = 47773440.

The previous prime is 57138811. The next prime is 57138827. The reversal of 57138823 is 32883175.

It is a cyclic number.

It is not a de Polignac number, because 57138823 - 2⁵ = 57138791 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 (57138827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86113 + ... + 86773.

It is an arithmetic number, because the mean of its divisors is an integer number (4182516).

Almost surely, 2^57138823 is an apocalyptic number.

57138823 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

57138823 is a deficient number, since it is larger than the sum of its proper divisors (9781433).

57138823 is a wasteful number, since it uses less digits than its factorization.

57138823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its digits is 40320, while the sum is 37.

The square root of 57138823 is about 7559.0226220061. The cubic root of 57138823 is about 385.1622928526.

The spelling of 57138823 in words is "fifty-seven million, one hundred thirty-eight thousand, eight hundred twenty-three".