30993994 has 4 divisors (see below), whose sum is σ = 46490994. Its totient is φ = 15496996.

The previous prime is 30993973. The next prime is 30994091. The reversal of 30993994 is 49939903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49939903 = 13 ⋅3841531.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 13227769 = 4215^2 + 3637^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7748497 + ... + 7748500.

Almost surely, 2^30993994 is an apocalyptic number.

30993994 is a deficient number, since it is larger than the sum of its proper divisors (15497000).

30993994 is a wasteful number, since it uses less digits than its factorization.

30993994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15496999.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 30993994 is about 5567.2249819816. The cubic root of 30993994 is about 314.1177766899.

The spelling of 30993994 in words is "thirty million, nine hundred ninety-three thousand, nine hundred ninety-four".