30018939 has 4 divisors (see below), whose sum is σ = 40025256. Its totient is φ = 20012624.

The previous prime is 30018931. The next prime is 30018971. The reversal of 30018939 is 93981003.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30018939 - 2³ = 30018931 is a prime.

It is a super-2 number, since 2×30018939² = 1802273397371442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30018931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5003154 + ... + 5003159.

It is an arithmetic number, because the mean of its divisors is an integer number (10006314).

Almost surely, 2^30018939 is an apocalyptic number.

30018939 is a deficient number, since it is larger than the sum of its proper divisors (10006317).

30018939 is a wasteful number, since it uses less digits than its factorization.

30018939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006316.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 30018939 is about 5478.9541885290. The cubic root of 30018939 is about 310.7886233701.

The spelling of 30018939 in words is "thirty million, eighteen thousand, nine hundred thirty-nine".