31398 has 8 divisors (see below), whose sum is σ = 62808. Its totient is φ = 10464.

The previous prime is 31397. The next prime is 31469. The reversal of 31398 is 89313.

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

31398 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31398.

It is not an unprimeable number, because it can be changed into a prime (31391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2611 + ... + 2622.

It is an arithmetic number, because the mean of its divisors is an integer number (7851).

2³¹³⁹⁸ is an apocalyptic number.

31398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31404).

31398 is a wasteful number, since it uses less digits than its factorization.

31398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238.

The product of its digits is 648, while the sum is 24.

The square root of 31398 is about 177.1948080503. The cubic root of 31398 is about 31.5476728383.

The spelling of 31398 in words is "thirty-one thousand, three hundred ninety-eight".