18476809 has 4 divisors (see below), whose sum is σ = 19898116. Its totient is φ = 17055504.

The previous prime is 18476789. The next prime is 18476831. The reversal of 18476809 is 90867481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6553600 + 11923209 = 2560^2 + 3453^2 .

It is a cyclic number.

It is not a de Polignac number, because 18476809 - 2⁷ = 18476681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18476869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710634 + ... + 710659.

It is an arithmetic number, because the mean of its divisors is an integer number (4974529).

Almost surely, 2^18476809 is an apocalyptic number.

It is an amenable number.

18476809 is a deficient number, since it is larger than the sum of its proper divisors (1421307).

18476809 is a wasteful number, since it uses less digits than its factorization.

18476809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421306.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18476809 is about 4298.4658891284. The cubic root of 18476809 is about 264.3680634820.

The spelling of 18476809 in words is "eighteen million, four hundred seventy-six thousand, eight hundred nine".