231998 has 8 divisors (see below), whose sum is σ = 374808. Its totient is φ = 107064.

The previous prime is 231967. The next prime is 232003. The reversal of 231998 is 899132.

231998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4436 + ... + 4487.

It is an arithmetic number, because the mean of its divisors is an integer number (46851).

2²³¹⁹⁹⁸ is an apocalyptic number.

231998 is a deficient number, since it is larger than the sum of its proper divisors (142810).

231998 is a wasteful number, since it uses less digits than its factorization.

231998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8938.

The product of its digits is 3888, while the sum is 32.

The square root of 231998 is about 481.6617070102. The cubic root of 231998 is about 61.4461599433.

It can be divided in two parts, 23 and 1998, that multiplied together give a palindrome (45954).

The spelling of 231998 in words is "two hundred thirty-one thousand, nine hundred ninety-eight".