42288831 has 32 divisors (see below), whose sum is σ = 67907840. Its totient is φ = 25855200.

The previous prime is 42288821. The next prime is 42288853. The reversal of 42288831 is 13888224.

It is a happy number.

It is not a de Polignac number, because 42288831 - 2⁷ = 42288703 is a prime.

It is a super-2 number, since 2×42288831² = 3576690454693122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42288821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73776 + ... + 74346.

It is an arithmetic number, because the mean of its divisors is an integer number (2122120).

Almost surely, 2^42288831 is an apocalyptic number.

42288831 is a deficient number, since it is larger than the sum of its proper divisors (25619009).

42288831 is a wasteful number, since it uses less digits than its factorization.

42288831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 798 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 42288831 is about 6502.9863139945. The cubic root of 42288831 is about 348.3976577917.

It can be divided in two parts, 422 and 88831, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 42288831 in words is "forty-two million, two hundred eighty-eight thousand, eight hundred thirty-one".