857910042 has 96 divisors (see below), whose sum is σ = 2113413120. Its totient is φ = 258675120.

The previous prime is 857910041. The next prime is 857910047. The reversal of 857910042 is 240019758.

It is a junction number, because it is equal to n+sod(n) for n = 857909979 and 857910006.

It is not an unprimeable number, because it can be changed into a prime (857910041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2047309 + ... + 2047727.

It is an arithmetic number, because the mean of its divisors is an integer number (22014720).

Almost surely, 2^857910042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857910042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056706560).

857910042 is an abundant number, since it is smaller than the sum of its proper divisors (1255503078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857910042 is a wasteful number, since it uses less digits than its factorization.

857910042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 857910042 is about 29290.1014337609. The cubic root of 857910042 is about 950.1975736811.

The spelling of 857910042 in words is "eight hundred fifty-seven million, nine hundred ten thousand, forty-two".