42855857 has 16 divisors (see below), whose sum is σ = 48744960. Its totient is φ = 37324800.

The previous prime is 42855847. The next prime is 42855859. The reversal of 42855857 is 75855824.

It is a cyclic number.

It is not a de Polignac number, because 42855857 - 2¹⁸ = 42593713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42855859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36593 + ... + 37745.

It is an arithmetic number, because the mean of its divisors is an integer number (3046560).

Almost surely, 2^42855857 is an apocalyptic number.

It is an amenable number.

42855857 is a deficient number, since it is larger than the sum of its proper divisors (5889103).

42855857 is a wasteful number, since it uses less digits than its factorization.

42855857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304.

The product of its digits is 448000, while the sum is 44.

The square root of 42855857 is about 6546.4384973816. The cubic root of 42855857 is about 349.9479024497.

It can be divided in two parts, 42855 and 857, that multiplied together give a triangular number (36726735 = T₈₅₇₀).

The spelling of 42855857 in words is "forty-two million, eight hundred fifty-five thousand, eight hundred fifty-seven".