18798012 has 18 divisors (see below), whose sum is σ = 47517288. Its totient is φ = 6265992.

The previous prime is 18797983. The next prime is 18798037. The reversal of 18798012 is 21089781.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 522167 = 18798012 / (1 + 8 + 7 + 9 + 8 + 0 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 261048 + ... + 261119.

Almost surely, 2^18798012 is an apocalyptic number.

18798012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18798012 is an abundant number, since it is smaller than the sum of its proper divisors (28719276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18798012 is a wasteful number, since it uses less digits than its factorization.

18798012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522177 (or 522172 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18798012 is about 4335.6674226698. The cubic root of 18798012 is about 265.8912061926.

The spelling of 18798012 in words is "eighteen million, seven hundred ninety-eight thousand, twelve".