123431998 has 8 divisors (see below), whose sum is σ = 185240160. Its totient is φ = 61685280.

The previous prime is 123431981. The next prime is 123432013. The reversal of 123431998 is 899134321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 123431998.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 9958 + ... + 18601.

It is an arithmetic number, because the mean of its divisors is an integer number (23155020).

Almost surely, 2^123431998 is an apocalyptic number.

123431998 is a deficient number, since it is larger than the sum of its proper divisors (61808162).

123431998 is a wasteful number, since it uses less digits than its factorization.

123431998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30722.

The product of its digits is 46656, while the sum is 40.

The square root of 123431998 is about 11109.9954095400. The cubic root of 123431998 is about 497.9005274353.

It can be divided in two parts, 12343 and 1998, that added together give a palindrome (14341).

The spelling of 123431998 in words is "one hundred twenty-three million, four hundred thirty-one thousand, nine hundred ninety-eight".