18790809 has 8 divisors (see below), whose sum is σ = 25134720. Its totient is φ = 12487056.

The previous prime is 18790799. The next prime is 18790813. The reversal of 18790809 is 90809781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18790809 - 2⁵ = 18790777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18790819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8929 + ... + 10830.

It is an arithmetic number, because the mean of its divisors is an integer number (3141840).

Almost surely, 2^18790809 is an apocalyptic number.

It is an amenable number.

18790809 is a deficient number, since it is larger than the sum of its proper divisors (6343911).

18790809 is a wasteful number, since it uses less digits than its factorization.

18790809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20079.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 18790809 is about 4334.8366751240. The cubic root of 18790809 is about 265.8572405613.

The spelling of 18790809 in words is "eighteen million, seven hundred ninety thousand, eight hundred nine".