30215925 has 18 divisors (see below), whose sum is σ = 54120482. Its totient is φ = 16115040.

The previous prime is 30215921. The next prime is 30215957. The reversal of 30215925 is 52951203.

It can be written as a sum of positive squares in 3 ways, for example, as 6625476 + 23590449 = 2574^2 + 4857^2 .

It is not a de Polignac number, because 30215925 - 2² = 30215921 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30215921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 66922 + ... + 67371.

Almost surely, 2^30215925 is an apocalyptic number.

It is an amenable number.

30215925 is a deficient number, since it is larger than the sum of its proper divisors (23904557).

30215925 is a wasteful number, since it uses less digits than its factorization.

30215925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134309 (or 134301 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 30215925 is about 5496.9013998798. The cubic root of 30215925 is about 311.4669460550.

The spelling of 30215925 in words is "thirty million, two hundred fifteen thousand, nine hundred twenty-five".