30993918 has 8 divisors (see below), whose sum is σ = 61987848. Its totient is φ = 10331304.

The previous prime is 30993913. The next prime is 30993929. The reversal of 30993918 is 81939903.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

30993918 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 30993918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30993913) 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, 2582821 + ... + 2582832.

It is an arithmetic number, because the mean of its divisors is an integer number (7748481).

Almost surely, 2^30993918 is an apocalyptic number.

30993918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

30993918 is a wasteful number, since it uses less digits than its factorization.

30993918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165658.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 30993918 is about 5567.2181563147. The cubic root of 30993918 is about 314.1175199416.

The spelling of 30993918 in words is "thirty million, nine hundred ninety-three thousand, nine hundred eighteen".