31396398 has 32 divisors (see below), whose sum is σ = 72109440. Its totient is φ = 9012960.

The previous prime is 31396381. The next prime is 31396439. The reversal of 31396398 is 89369313.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11265 + ... + 13772.

It is an arithmetic number, because the mean of its divisors is an integer number (2253420).

Almost surely, 2^31396398 is an apocalyptic number.

31396398 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31396398 is an abundant number, since it is smaller than the sum of its proper divisors (40713042).

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

31396398 is a wasteful number, since it uses less digits than its factorization.

31396398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25072.

The product of its digits is 104976, while the sum is 42.

The square root of 31396398 is about 5603.2488789987. The cubic root of 31396398 is about 315.4713628367.

The spelling of 31396398 in words is "thirty-one million, three hundred ninety-six thousand, three hundred ninety-eight".