18364817 has 2 divisors, whose sum is σ = 18364818. Its totient is φ = 18364816.

The previous prime is 18364799. The next prime is 18364831. The reversal of 18364817 is 71846381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11806096 + 6558721 = 3436^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 18364817 - 2¹² = 18360721 is a prime.

It is not a weakly prime, because it can be changed into another prime (18364897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182408 + 9182409.

It is an arithmetic number, because the mean of its divisors is an integer number (9182409).

Almost surely, 2^18364817 is an apocalyptic number.

It is an amenable number.

18364817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18364817 is an equidigital number, since it uses as much as digits as its factorization.

18364817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 18364817 is about 4285.4191160259. The cubic root of 18364817 is about 263.8328496939.

The spelling of 18364817 in words is "eighteen million, three hundred sixty-four thousand, eight hundred seventeen".