30972538 has 8 divisors (see below), whose sum is σ = 49191732. Its totient is φ = 14575296.

The previous prime is 30972533. The next prime is 30972553. The reversal of 30972538 is 83527903.

It can be written as a sum of positive squares in 2 ways, for example, as 23590449 + 7382089 = 4857^2 + 2717^2 .

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

It is a super-2 number, since 2×30972538² = 1918596220322888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30972497 and 30972506.

It is not an unprimeable number, because it can be changed into a prime (30972533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455445 + ... + 455512.

Almost surely, 2^30972538 is an apocalyptic number.

30972538 is a deficient number, since it is larger than the sum of its proper divisors (18219194).

30972538 is a wasteful number, since it uses less digits than its factorization.

30972538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910976.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 30972538 is about 5565.2976560109. The cubic root of 30972538 is about 314.0452759033.

The spelling of 30972538 in words is "thirty million, nine hundred seventy-two thousand, five hundred thirty-eight".