31906345 has 8 divisors (see below), whose sum is σ = 38347776. Its totient is φ = 25484976.

The previous prime is 31906319. The next prime is 31906349. The reversal of 31906345 is 54360913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31906345 - 2²¹ = 29809193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31906349) 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, 1257 + ... + 8086.

It is an arithmetic number, because the mean of its divisors is an integer number (4793472).

Almost surely, 2^31906345 is an apocalyptic number.

It is an amenable number.

31906345 is a deficient number, since it is larger than the sum of its proper divisors (6441431).

31906345 is an equidigital number, since it uses as much as digits as its factorization.

31906345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10031.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 31906345 is about 5648.5701730615. The cubic root of 31906345 is about 317.1701826471.

The spelling of 31906345 in words is "thirty-one million, nine hundred six thousand, three hundred forty-five".