30138644 has 12 divisors (see below), whose sum is σ = 52817268. Its totient is φ = 15048000.

The previous prime is 30138629. The next prime is 30138659. The reversal of 30138644 is 44683103.

It is an interprime number because it is at equal distance from previous prime (30138629) and next prime (30138659).

It can be written as a sum of positive squares in 2 ways, for example, as 12816400 + 17322244 = 3580^2 + 4162^2 .

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, 1907 + ... + 7994.

It is an arithmetic number, because the mean of its divisors is an integer number (4401439).

Almost surely, 2^30138644 is an apocalyptic number.

It is an amenable number.

30138644 is a deficient number, since it is larger than the sum of its proper divisors (22678624).

30138644 is a wasteful number, since it uses less digits than its factorization.

30138644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666 (or 10664 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 30138644 is about 5489.8673936626. The cubic root of 30138644 is about 311.2011808186.

The spelling of 30138644 in words is "thirty million, one hundred thirty-eight thousand, six hundred forty-four".