9931390 has 32 divisors (see below), whose sum is σ = 20539584. Its totient is φ = 3386880.

The previous prime is 9931381. The next prime is 9931393. The reversal of 9931390 is 931399.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9931393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23380 + ... + 23800.

It is an arithmetic number, because the mean of its divisors is an integer number (641862).

Almost surely, 2^9931390 is an apocalyptic number.

9931390 is an abundant number, since it is smaller than the sum of its proper divisors (10608194).

9931390 is a wasteful number, since it uses less digits than its factorization.

9931390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 9931390 is about 3151.4107951836. The cubic root of 9931390 is about 214.9496186258.

The spelling of 9931390 in words is "nine million, nine hundred thirty-one thousand, three hundred ninety".