42189431 has 12 divisors (see below), whose sum is σ = 44030952. Its totient is φ = 40401504.

The previous prime is 42189421. The next prime is 42189437. The reversal of 42189431 is 13498124.

It is a happy number.

42189431 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 42189431 - 2²² = 37995127 is a prime.

It is a super-2 number, since 2×42189431² = 3559896176207522, 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 (42189437) 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 11 ways as a sum of consecutive naturals, for example, 387005 + ... + 387113.

It is an arithmetic number, because the mean of its divisors is an integer number (3669246).

Almost surely, 2^42189431 is an apocalyptic number.

42189431 is a deficient number, since it is larger than the sum of its proper divisors (1841521).

42189431 is an equidigital number, since it uses as much as digits as its factorization.

42189431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 229 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 42189431 is about 6495.3391751317. The cubic root of 42189431 is about 348.1244737928.

The spelling of 42189431 in words is "forty-two million, one hundred eighty-nine thousand, four hundred thirty-one".