231439642 has 12 divisors (see below), whose sum is σ = 403838730. Its totient is φ = 99188376.

The previous prime is 231439613. The next prime is 231439643. The reversal of 231439642 is 246934132.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 163558521 + 67881121 = 12789^2 + 8239^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231439598 and 231439607.

It is not an unprimeable number, because it can be changed into a prime (231439643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1180717 + ... + 1180912.

Almost surely, 2^231439642 is an apocalyptic number.

231439642 is a deficient number, since it is larger than the sum of its proper divisors (172399088).

231439642 is a wasteful number, since it uses less digits than its factorization.

231439642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361645 (or 2361638 counting only the distinct ones).

The product of its digits is 31104, while the sum is 34.

The square root of 231439642 is about 15213.1404384499. The cubic root of 231439642 is about 613.9682544321.

The spelling of 231439642 in words is "two hundred thirty-one million, four hundred thirty-nine thousand, six hundred forty-two".