18922417 has 2 divisors, whose sum is σ = 18922418. Its totient is φ = 18922416.

The previous prime is 18922391. The next prime is 18922427. The reversal of 18922417 is 71422981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15649936 + 3272481 = 3956^2 + 1809^2 .

It is a cyclic number.

It is not a de Polignac number, because 18922417 - 2⁷ = 18922289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18922427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461208 + 9461209.

It is an arithmetic number, because the mean of its divisors is an integer number (9461209).

Almost surely, 2^18922417 is an apocalyptic number.

It is an amenable number.

18922417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18922417 is an equidigital number, since it uses as much as digits as its factorization.

18922417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 18922417 is about 4349.9904597597. The cubic root of 18922417 is about 266.4764718448.

The spelling of 18922417 in words is "eighteen million, nine hundred twenty-two thousand, four hundred seventeen".