18919636 has 12 divisors (see below), whose sum is σ = 33173728. Its totient is φ = 9441432.

The previous prime is 18919603. The next prime is 18919643. The reversal of 18919636 is 63691981.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18919592 and 18919601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136 + ... + 6511.

Almost surely, 2^18919636 is an apocalyptic number.

It is an amenable number.

18919636 is a deficient number, since it is larger than the sum of its proper divisors (14254092).

18919636 is a wasteful number, since it uses less digits than its factorization.

18919636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198 (or 9196 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The square root of 18919636 is about 4349.6707921405. The cubic root of 18919636 is about 266.4634166525.

The spelling of 18919636 in words is "eighteen million, nine hundred nineteen thousand, six hundred thirty-six".