30997970 has 16 divisors (see below), whose sum is σ = 59078808. Its totient is φ = 11669760.

The previous prime is 30997933. The next prime is 30997991. The reversal of 30997970 is 7979903.

It can be written as a sum of positive squares in 4 ways, for example, as 20802721 + 10195249 = 4561^2 + 3193^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91001 + ... + 91340.

Almost surely, 2^30997970 is an apocalyptic number.

30997970 is a deficient number, since it is larger than the sum of its proper divisors (28080838).

30997970 is a wasteful number, since it uses less digits than its factorization.

30997970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182365.

The product of its (nonzero) digits is 107163, while the sum is 44.

The square root of 30997970 is about 5567.5820604639. The cubic root of 30997970 is about 314.1312080973.

The spelling of 30997970 in words is "thirty million, nine hundred ninety-seven thousand, nine hundred seventy".