30138924 has 24 divisors (see below), whose sum is σ = 73382400. Its totient is φ = 9609424.

The previous prime is 30138907. The next prime is 30138929. The reversal of 30138924 is 42983103.

It is a junction number, because it is equal to n+sod(n) for n = 30138891 and 30138900.

It is not an unprimeable number, because it can be changed into a prime (30138929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54324 + ... + 54875.

It is an arithmetic number, because the mean of its divisors is an integer number (3057600).

Almost surely, 2^30138924 is an apocalyptic number.

It is an amenable number.

30138924 is an abundant number, since it is smaller than the sum of its proper divisors (43243476).

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

30138924 is a wasteful number, since it uses less digits than its factorization.

30138924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109229 (or 109227 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 30138924 is about 5489.8928951301. The cubic root of 30138924 is about 311.2021445433.

The spelling of 30138924 in words is "thirty million, one hundred thirty-eight thousand, nine hundred twenty-four".