18610809 has 16 divisors (see below), whose sum is σ = 28523520. Its totient is φ = 10573200.

The previous prime is 18610807. The next prime is 18610829. The reversal of 18610809 is 90801681.

It is not a de Polignac number, because 18610809 - 2¹ = 18610807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18610809.

It is not an unprimeable number, because it can be changed into a prime (18610807) 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, 1284 + ... + 6234.

It is an arithmetic number, because the mean of its divisors is an integer number (1782720).

Almost surely, 2^18610809 is an apocalyptic number.

It is an amenable number.

18610809 is a deficient number, since it is larger than the sum of its proper divisors (9912711).

18610809 is a wasteful number, since it uses less digits than its factorization.

18610809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 18610809 is about 4314.0246869947. The cubic root of 18610809 is about 265.0056199117.

The spelling of 18610809 in words is "eighteen million, six hundred ten thousand, eight hundred nine".