18994689 has 16 divisors (see below), whose sum is σ = 32160640. Its totient is φ = 10854000.

The previous prime is 18994687. The next prime is 18994693. The reversal of 18994689 is 98649981.

It is not a de Polignac number, because 18994689 - 2¹ = 18994687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18994687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50062 + ... + 50439.

It is an arithmetic number, because the mean of its divisors is an integer number (2010040).

Almost surely, 2^18994689 is an apocalyptic number.

It is an amenable number.

18994689 is a deficient number, since it is larger than the sum of its proper divisors (13165951).

18994689 is a wasteful number, since it uses less digits than its factorization.

18994689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100517 (or 100511 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 18994689 is about 4358.2896874806. The cubic root of 18994689 is about 266.8152996058.

It can be divided in two parts, 18994 and 689, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18994689 in words is "eighteen million, nine hundred ninety-four thousand, six hundred eighty-nine".