30815930 has 16 divisors (see below), whose sum is σ = 56042280. Its totient is φ = 12198912.

The previous prime is 30815927. The next prime is 30815933. The reversal of 30815930 is 3951803.

It is an interprime number because it is at equal distance from previous prime (30815927) and next prime (30815933).

It can be written as a sum of positive squares in 4 ways, for example, as 20620681 + 10195249 = 4541^2 + 3193^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30815893 and 30815902.

It is not an unprimeable number, because it can be changed into a prime (30815933) 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, 14915 + ... + 16854.

Almost surely, 2^30815930 is an apocalyptic number.

30815930 is a deficient number, since it is larger than the sum of its proper divisors (25226350).

30815930 is a wasteful number, since it uses less digits than its factorization.

30815930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31873.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 30815930 is about 5551.2097780574. The cubic root of 30815930 is about 313.5150736316.

The spelling of 30815930 in words is "thirty million, eight hundred fifteen thousand, nine hundred thirty".