18996309 has 16 divisors (see below), whose sum is σ = 28565440. Its totient is φ = 12474000.

The previous prime is 18996277. The next prime is 18996311. The reversal of 18996309 is 90369981.

18996309 is a `hidden beast` number, since 1 + 8 + 9 + 9 + 630 + 9 = 666.

It is not a de Polignac number, because 18996309 - 2⁵ = 18996277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18996349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3442 + ... + 7059.

It is an arithmetic number, because the mean of its divisors is an integer number (1785340).

Almost surely, 2^18996309 is an apocalyptic number.

It is an amenable number.

18996309 is a deficient number, since it is larger than the sum of its proper divisors (9569131).

18996309 is a wasteful number, since it uses less digits than its factorization.

18996309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10577 (or 10571 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 18996309 is about 4358.4755362397. The cubic root of 18996309 is about 266.8228846822.

The spelling of 18996309 in words is "eighteen million, nine hundred ninety-six thousand, three hundred nine".