18238417 has 2 divisors, whose sum is σ = 18238418. Its totient is φ = 18238416.

The previous prime is 18238411. The next prime is 18238427. The reversal of 18238417 is 71483281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 463761 = 4216^2 + 681^2 .

It is an emirp because it is prime and its reverse (71483281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18238417 - 2⁷ = 18238289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18238411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119208 + 9119209.

It is an arithmetic number, because the mean of its divisors is an integer number (9119209).

Almost surely, 2^18238417 is an apocalyptic number.

It is an amenable number.

18238417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238417 is an equidigital number, since it uses as much as digits as its factorization.

18238417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 18238417 is about 4270.6459698739. The cubic root of 18238417 is about 263.2261592749.

The spelling of 18238417 in words is "eighteen million, two hundred thirty-eight thousand, four hundred seventeen".