30138748 has 12 divisors (see below), whose sum is σ = 52945200. Its totient is φ = 15011552.

The previous prime is 30138709. The next prime is 30138791. The reversal of 30138748 is 84783103.

It is a congruent number.

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, 13273 + ... + 15376.

It is an arithmetic number, because the mean of its divisors is an integer number (4412100).

Almost surely, 2^30138748 is an apocalyptic number.

It is an amenable number.

30138748 is a deficient number, since it is larger than the sum of its proper divisors (22806452).

30138748 is a wasteful number, since it uses less digits than its factorization.

30138748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28916 (or 28914 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 30138748 is about 5489.8768656501. The cubic root of 30138748 is about 311.2015387742.

The spelling of 30138748 in words is "thirty million, one hundred thirty-eight thousand, seven hundred forty-eight".