18899474 has 24 divisors (see below), whose sum is σ = 32247180. Its totient is φ = 8291360.

The previous prime is 18899467. The next prime is 18899497. The reversal of 18899474 is 47499881.

It can be written as a sum of positive squares in 2 ways, for example, as 18879025 + 20449 = 4345^2 + 143^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5672 + ... + 8364.

Almost surely, 2^18899474 is an apocalyptic number.

18899474 is a deficient number, since it is larger than the sum of its proper divisors (13347706).

18899474 is a wasteful number, since it uses less digits than its factorization.

18899474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746 (or 2735 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 18899474 is about 4347.3525276885. The cubic root of 18899474 is about 266.3687294019.

The spelling of 18899474 in words is "eighteen million, eight hundred ninety-nine thousand, four hundred seventy-four".