30993138 has 32 divisors (see below), whose sum is σ = 75136320. Its totient is φ = 9391680.

The previous prime is 30993107. The next prime is 30993139. The reversal of 30993138 is 83139903.

It is not an unprimeable number, because it can be changed into a prime (30993139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25495 + ... + 26682.

It is an arithmetic number, because the mean of its divisors is an integer number (2348010).

Almost surely, 2^30993138 is an apocalyptic number.

30993138 is an abundant number, since it is smaller than the sum of its proper divisors (44143182).

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

30993138 is a wasteful number, since it uses less digits than its factorization.

30993138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52199 (or 52193 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 30993138 is about 5567.1481029339. The cubic root of 30993138 is about 314.1148848684.

The spelling of 30993138 in words is "thirty million, nine hundred ninety-three thousand, one hundred thirty-eight".