18804961 has 16 divisors (see below), whose sum is σ = 22560768. Its totient is φ = 15325200.

The previous prime is 18804959. The next prime is 18804967. The reversal of 18804961 is 16940881.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18804961 - 2¹ = 18804959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18804961.

It is not an unprimeable number, because it can be changed into a prime (18804967) 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 15 ways as a sum of consecutive naturals, for example, 43416 + ... + 43846.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^18804961 is an apocalyptic number.

It is an amenable number.

18804961 is a deficient number, since it is larger than the sum of its proper divisors (3755807).

18804961 is a wasteful number, since it uses less digits than its factorization.

18804961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18804961 is about 4336.4687246653. The cubic root of 18804961 is about 265.9239658689.

The spelling of 18804961 in words is "eighteen million, eight hundred four thousand, nine hundred sixty-one".