31445930 has 24 divisors (see below), whose sum is σ = 58199148. Its totient is φ = 12233088.

The previous prime is 31445929. The next prime is 31445941. The reversal of 31445930 is 3954413.

It can be written as a sum of positive squares in 6 ways, for example, as 26306641 + 5139289 = 5129^2 + 2267^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31445893 and 31445902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12542 + ... + 14838.

Almost surely, 2^31445930 is an apocalyptic number.

31445930 is a deficient number, since it is larger than the sum of its proper divisors (26753218).

31445930 is a wasteful number, since it uses less digits than its factorization.

31445930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2341 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 31445930 is about 5607.6670728566. The cubic root of 31445930 is about 315.6371750360.

The spelling of 31445930 in words is "thirty-one million, four hundred forty-five thousand, nine hundred thirty".