311998 has 8 divisors (see below), whose sum is σ = 470592. Its totient is φ = 155136.

The previous prime is 311981. The next prime is 312007. The reversal of 311998 is 899113.

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, 211 + ... + 817.

It is an arithmetic number, because the mean of its divisors is an integer number (58824).

2³¹¹⁹⁹⁸ is an apocalyptic number.

311998 is a deficient number, since it is larger than the sum of its proper divisors (158594).

311998 is a wasteful number, since it uses less digits than its factorization.

311998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866.

The product of its digits is 1944, while the sum is 31.

The square root of 311998 is about 558.5678114607. The cubic root of 311998 is about 67.8240839364.

The spelling of 311998 in words is "three hundred eleven thousand, nine hundred ninety-eight".