231990242 has 32 divisors (see below), whose sum is σ = 387901440. Its totient is φ = 103168080.

The previous prime is 231990223. The next prime is 231990251. The reversal of 231990242 is 242099132.

It is a junction number, because it is equal to n+sod(n) for n = 231990199 and 231990208.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 476123 + ... + 476609.

It is an arithmetic number, because the mean of its divisors is an integer number (12121920).

Almost surely, 2^231990242 is an apocalyptic number.

231990242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231990242 is a deficient number, since it is larger than the sum of its proper divisors (155911198).

231990242 is a wasteful number, since it uses less digits than its factorization.

231990242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 231990242 is about 15231.2258863166. The cubic root of 231990242 is about 614.4547501694.

It can be divided in two parts, 231990 and 242, that added together give a palindrome (232232).

The spelling of 231990242 in words is "two hundred thirty-one million, nine hundred ninety thousand, two hundred forty-two".