31980730 has 32 divisors (see below), whose sum is σ = 59439744. Its totient is φ = 12382656.

The previous prime is 31980721. The next prime is 31980731. The reversal of 31980730 is 3708913.

It is a junction number, because it is equal to n+sod(n) for n = 31980692 and 31980701.

It is not an unprimeable number, because it can be changed into a prime (31980731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43627 + ... + 44353.

It is an arithmetic number, because the mean of its divisors is an integer number (1857492).

Almost surely, 2^31980730 is an apocalyptic number.

31980730 is a deficient number, since it is larger than the sum of its proper divisors (27459014).

31980730 is a wasteful number, since it uses less digits than its factorization.

31980730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 31980730 is about 5655.1507495380. The cubic root of 31980730 is about 317.4164700593.

The spelling of 31980730 in words is "thirty-one million, nine hundred eighty thousand, seven hundred thirty".