30818939 has 4 divisors (see below), whose sum is σ = 31118256. Its totient is φ = 30519624.

The previous prime is 30818903. The next prime is 30818947. The reversal of 30818939 is 93981803.

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 30818939 - 2¹² = 30814843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30818896 and 30818905.

It is not an unprimeable number, because it can be changed into a prime (30818959) 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, 149504 + ... + 149709.

It is an arithmetic number, because the mean of its divisors is an integer number (7779564).

Almost surely, 2^30818939 is an apocalyptic number.

30818939 is a deficient number, since it is larger than the sum of its proper divisors (299317).

30818939 is a wasteful number, since it uses less digits than its factorization.

30818939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299316.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 30818939 is about 5551.4807934460. The cubic root of 30818939 is about 313.5252776198.

The spelling of 30818939 in words is "thirty million, eight hundred eighteen thousand, nine hundred thirty-nine".