18604913 has 2 divisors, whose sum is σ = 18604914. Its totient is φ = 18604912.

The previous prime is 18604909. The next prime is 18604931. The reversal of 18604913 is 31940681.

It is a happy number.

Together with next prime (18604931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14348944 + 4255969 = 3788^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 18604913 - 2² = 18604909 is a prime.

It is a super-2 number, since 2×18604913² = 692285575475138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18604913.

It is not a weakly prime, because it can be changed into another prime (18604973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9302456 + 9302457.

It is an arithmetic number, because the mean of its divisors is an integer number (9302457).

Almost surely, 2^18604913 is an apocalyptic number.

It is an amenable number.

18604913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18604913 is an equidigital number, since it uses as much as digits as its factorization.

18604913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18604913 is about 4313.3412802606. The cubic root of 18604913 is about 264.9776319081.

The spelling of 18604913 in words is "eighteen million, six hundred four thousand, nine hundred thirteen".