18994356 has 36 divisors (see below), whose sum is σ = 48223812. Its totient is φ = 6303744.

The previous prime is 18994337. The next prime is 18994361. The reversal of 18994356 is 65349981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15444900 + 3549456 = 3930^2 + 1884^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8226 + ... + 10278.

Almost surely, 2^18994356 is an apocalyptic number.

It is an amenable number.

18994356 is an abundant number, since it is smaller than the sum of its proper divisors (29229456).

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

18994356 is a wasteful number, since it uses less digits than its factorization.

18994356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320 (or 2315 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 18994356 is about 4358.2514842537. The cubic root of 18994356 is about 266.8137403978.

The spelling of 18994356 in words is "eighteen million, nine hundred ninety-four thousand, three hundred fifty-six".