42439831 has 6 divisors (see below), whose sum is σ = 49368840. Its totient is φ = 36376956.

The previous prime is 42439823. The next prime is 42439849. The reversal of 42439831 is 13893424.

42439831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42439831 - 2³ = 42439823 is a prime.

It is a super-2 number, since 2×42439831² = 3602278510617122, 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 (42439931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433011 + ... + 433108.

It is an arithmetic number, because the mean of its divisors is an integer number (8228140).

Almost surely, 2^42439831 is an apocalyptic number.

42439831 is a deficient number, since it is larger than the sum of its proper divisors (6929009).

42439831 is an equidigital number, since it uses as much as digits as its factorization.

42439831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866133 (or 866126 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 42439831 is about 6514.5860190806. The cubic root of 42439831 is about 348.8118377178.

The spelling of 42439831 in words is "forty-two million, four hundred thirty-nine thousand, eight hundred thirty-one".