57138842 has 8 divisors (see below), whose sum is σ = 85900500. Its totient is φ = 28505344.

The previous prime is 57138839. The next prime is 57138847. The reversal of 57138842 is 24883175.

It can be written as a sum of positive squares in 2 ways, for example, as 57138481 + 361 = 7559^2 + 19^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 57138796 and 57138805.

It is not an unprimeable number, because it can be changed into a prime (57138847) 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 3 ways as a sum of consecutive naturals, for example, 30917 + ... + 32712.

Almost surely, 2^57138842 is an apocalyptic number.

57138842 is a deficient number, since it is larger than the sum of its proper divisors (28761658).

57138842 is a wasteful number, since it uses less digits than its factorization.

57138842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64080.

The product of its digits is 53760, while the sum is 38.

The square root of 57138842 is about 7559.0238787822. The cubic root of 57138842 is about 385.1623355444.

The spelling of 57138842 in words is "fifty-seven million, one hundred thirty-eight thousand, eight hundred forty-two".