31990343 has 24 divisors (see below), whose sum is σ = 40602240. Its totient is φ = 24670800.

The previous prime is 31990337. The next prime is 31990349. The reversal of 31990343 is 34309913.

It is an interprime number because it is at equal distance from previous prime (31990337) and next prime (31990349).

It is not a de Polignac number, because 31990343 - 2⁸ = 31990087 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31990349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151508 + ... + 151718.

It is an arithmetic number, because the mean of its divisors is an integer number (1691760).

Almost surely, 2^31990343 is an apocalyptic number.

31990343 is a deficient number, since it is larger than the sum of its proper divisors (8611897).

31990343 is a wasteful number, since it uses less digits than its factorization.

31990343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 31990343 is about 5656.0006188118. Note that the first 3 decimals coincide. The cubic root of 31990343 is about 317.4482706556.

The spelling of 31990343 in words is "thirty-one million, nine hundred ninety thousand, three hundred forty-three".