30138925 has 6 divisors (see below), whose sum is σ = 37372298. Its totient is φ = 24111120.

The previous prime is 30138907. The next prime is 30138929. The reversal of 30138925 is 52983103.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2292196 + 27846729 = 1514^2 + 5277^2 .

It is not a de Polignac number, because 30138925 - 2⁹ = 30138413 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 (30138929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602754 + ... + 602803.

Almost surely, 2^30138925 is an apocalyptic number.

It is an amenable number.

30138925 is a deficient number, since it is larger than the sum of its proper divisors (7233373).

30138925 is a wasteful number, since it uses less digits than its factorization.

30138925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205567 (or 1205562 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 30138925 is about 5489.8929862066. The cubic root of 30138925 is about 311.2021479851.

The spelling of 30138925 in words is "thirty million, one hundred thirty-eight thousand, nine hundred twenty-five".