311398 has 4 divisors (see below), whose sum is σ = 467100. Its totient is φ = 155698.

The previous prime is 311393. The next prime is 311407. The reversal of 311398 is 893113.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77848 + ... + 77851.

It is an arithmetic number, because the mean of its divisors is an integer number (116775).

2³¹¹³⁹⁸ is an apocalyptic number.

311398 is a deficient number, since it is larger than the sum of its proper divisors (155702).

311398 is a wasteful number, since it uses less digits than its factorization.

311398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155701.

The product of its digits is 648, while the sum is 25.

The square root of 311398 is about 558.0304651182. The cubic root of 311398 is about 67.7805787808.

The spelling of 311398 in words is "three hundred eleven thousand, three hundred ninety-eight".