30138128 has 20 divisors (see below), whose sum is σ = 59971980. Its totient is φ = 14661504.

The previous prime is 30138083. The next prime is 30138131. The reversal of 30138128 is 82183103.

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 11751184 = 4288^2 + 3428^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30138097 and 30138106.

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, 24863 + ... + 26046.

It is an arithmetic number, because the mean of its divisors is an integer number (2998599).

Almost surely, 2^30138128 is an apocalyptic number.

It is an amenable number.

30138128 is a deficient number, since it is larger than the sum of its proper divisors (29833852).

30138128 is a wasteful number, since it uses less digits than its factorization.

30138128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50954 (or 50948 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 30138128 is about 5489.8203977908. The cubic root of 30138128 is about 311.1994047962.

The spelling of 30138128 in words is "thirty million, one hundred thirty-eight thousand, one hundred twenty-eight".