18672805 has 8 divisors (see below), whose sum is σ = 22458744. Its totient is φ = 14904000.

The previous prime is 18672799. The next prime is 18672809. The reversal of 18672805 is 50827681.

It can be written as a sum of positive squares in 4 ways, for example, as 6155361 + 12517444 = 2481^2 + 3538^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-18672805 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 (18672809) 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 7 ways as a sum of consecutive naturals, for example, 1746 + ... + 6355.

It is an arithmetic number, because the mean of its divisors is an integer number (2807343).

Almost surely, 2^18672805 is an apocalyptic number.

It is an amenable number.

18672805 is a deficient number, since it is larger than the sum of its proper divisors (3785939).

18672805 is an equidigital number, since it uses as much as digits as its factorization.

18672805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8567.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 18672805 is about 4321.2041145958. The cubic root of 18672805 is about 265.2995544582.

The spelling of 18672805 in words is "eighteen million, six hundred seventy-two thousand, eight hundred five".