31993434 has 32 divisors (see below), whose sum is σ = 77561280. Its totient is φ = 9694800.

The previous prime is 31993421. The next prime is 31993441. The reversal of 31993434 is 43439913.

It is a super-2 number, since 2×31993434² = 2047159638224712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26337 + ... + 27524.

It is an arithmetic number, because the mean of its divisors is an integer number (2423790).

Almost surely, 2^31993434 is an apocalyptic number.

31993434 is an abundant number, since it is smaller than the sum of its proper divisors (45567846).

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

31993434 is a wasteful number, since it uses less digits than its factorization.

31993434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53883 (or 53877 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 31993434 is about 5656.2738618281. The cubic root of 31993434 is about 317.4584945847.

The spelling of 31993434 in words is "thirty-one million, nine hundred ninety-three thousand, four hundred thirty-four".