18519004 has 12 divisors (see below), whose sum is σ = 37038064. Its totient is φ = 7936704.

The previous prime is 18518999. The next prime is 18519019. The reversal of 18519004 is 40091581.

It is a happy number.

18519004 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 661393 = 18519004 / (1 + 8 + 5 + 1 + 9 + 0 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330669 + ... + 330724.

Almost surely, 2^18519004 is an apocalyptic number.

18519004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18519004 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.

18519004 is a wasteful number, since it uses less digits than its factorization.

18519004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661404 (or 661402 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18519004 is about 4303.3712366004. The cubic root of 18519004 is about 264.5691539359.

The spelling of 18519004 in words is "eighteen million, five hundred nineteen thousand, four".