42865057 has 4 divisors (see below), whose sum is σ = 43000596. Its totient is φ = 42729520.

The previous prime is 42865001. The next prime is 42865061. The reversal of 42865057 is 75056824.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18352656 + 24512401 = 4284^2 + 4951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42865057 is a prime.

It is a super-2 number, since 2×42865057² = 3674826223226498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42865087) 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, 67294 + ... + 67927.

It is an arithmetic number, because the mean of its divisors is an integer number (10750149).

Almost surely, 2^42865057 is an apocalyptic number.

It is an amenable number.

42865057 is a deficient number, since it is larger than the sum of its proper divisors (135539).

42865057 is a wasteful number, since it uses less digits than its factorization.

42865057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135538.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 42865057 is about 6547.1411318223. The cubic root of 42865057 is about 349.9729421259.

The spelling of 42865057 in words is "forty-two million, eight hundred sixty-five thousand, fifty-seven".