30138252 has 12 divisors (see below), whose sum is σ = 70322616. Its totient is φ = 10046080.

The previous prime is 30138217. The next prime is 30138271. The reversal of 30138252 is 25283103.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255749 + ... + 1255772.

It is an arithmetic number, because the mean of its divisors is an integer number (5860218).

Almost surely, 2^30138252 is an apocalyptic number.

It is an amenable number.

30138252 is an abundant number, since it is smaller than the sum of its proper divisors (40184364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30138252 is a wasteful number, since it uses less digits than its factorization.

30138252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511528 (or 2511526 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 30138252 is about 5489.8316914091. The cubic root of 30138252 is about 311.1998315941.

The spelling of 30138252 in words is "thirty million, one hundred thirty-eight thousand, two hundred fifty-two".