42919831 has 4 divisors (see below), whose sum is σ = 43463200. Its totient is φ = 42376464.

The previous prime is 42919829. The next prime is 42919843. The reversal of 42919831 is 13891924.

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

It is a cyclic number.

It is not a de Polignac number, because 42919831 - 2¹ = 42919829 is a prime.

It is a super-2 number, since 2×42919831² = 3684223786137122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42919871) 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, 271566 + ... + 271723.

It is an arithmetic number, because the mean of its divisors is an integer number (10865800).

Almost surely, 2^42919831 is an apocalyptic number.

42919831 is a deficient number, since it is larger than the sum of its proper divisors (543369).

42919831 is an equidigital number, since it uses as much as digits as its factorization.

42919831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543368.

The product of its digits is 15552, while the sum is 37.

The square root of 42919831 is about 6551.3228435179. The cubic root of 42919831 is about 350.1219466222.

The spelling of 42919831 in words is "forty-two million, nine hundred nineteen thousand, eight hundred thirty-one".