31923340 has 24 divisors (see below), whose sum is σ = 68467392. Its totient is φ = 12497280.

The previous prime is 31923323. The next prime is 31923349. The reversal of 31923340 is 4332913.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31923349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16041 + ... + 17920.

It is an arithmetic number, because the mean of its divisors is an integer number (2852808).

Almost surely, 2^31923340 is an apocalyptic number.

It is an amenable number.

31923340 is an abundant number, since it is smaller than the sum of its proper divisors (36544052).

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

31923340 is a wasteful number, since it uses less digits than its factorization.

31923340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34017 (or 34015 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 31923340 is about 5650.0743357942. The cubic root of 31923340 is about 317.2264865002.

The spelling of 31923340 in words is "thirty-one million, nine hundred twenty-three thousand, three hundred forty".