18994015 has 24 divisors (see below), whose sum is σ = 25511760. Its totient is φ = 13526784.

The previous prime is 18994007. The next prime is 18994033. The reversal of 18994015 is 51049981.

It is not a de Polignac number, because 18994015 - 2³ = 18994007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30376 + ... + 30994.

It is an arithmetic number, because the mean of its divisors is an integer number (1062990).

Almost surely, 2^18994015 is an apocalyptic number.

18994015 is a deficient number, since it is larger than the sum of its proper divisors (6517745).

18994015 is a wasteful number, since it uses less digits than its factorization.

18994015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 18994015 is about 4358.2123628846. The cubic root of 18994015 is about 266.8121437125.

The spelling of 18994015 in words is "eighteen million, nine hundred ninety-four thousand, fifteen".