31398380 has 24 divisors (see below), whose sum is σ = 71009232. Its totient is φ = 11593152.

The previous prime is 31398379. The next prime is 31398383. The reversal of 31398380 is 8389313.

It is a self number, because there is not a number n which added to its sum of digits gives 31398380.

It is not an unprimeable number, because it can be changed into a prime (31398383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60122 + ... + 60641.

It is an arithmetic number, because the mean of its divisors is an integer number (2958718).

Almost surely, 2^31398380 is an apocalyptic number.

It is an amenable number.

31398380 is an abundant number, since it is smaller than the sum of its proper divisors (39610852).

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

31398380 is a wasteful number, since it uses less digits than its factorization.

31398380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120785 (or 120783 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 31398380 is about 5603.4257378857. The cubic root of 31398380 is about 315.4780010831.

The spelling of 31398380 in words is "thirty-one million, three hundred ninety-eight thousand, three hundred eighty".