31313388 has 96 divisors (see below), whose sum is σ = 82252800. Its totient is φ = 9225216.

The previous prime is 31313377. The next prime is 31313389. The reversal of 31313388 is 88331313.

It is not an unprimeable number, because it can be changed into a prime (31313389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396333 + ... + 396411.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^31313388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31313388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41126400).

31313388 is an abundant number, since it is smaller than the sum of its proper divisors (50939412).

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

31313388 is a wasteful number, since it uses less digits than its factorization.

31313388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 197 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 31313388 is about 5595.8366666657. The cubic root of 31313388 is about 315.1930889730.

The spelling of 31313388 in words is "thirty-one million, three hundred thirteen thousand, three hundred eighty-eight".