18498817 has 2 divisors, whose sum is σ = 18498818. Its totient is φ = 18498816.

The previous prime is 18498811. The next prime is 18498827. The reversal of 18498817 is 71889481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14930496 + 3568321 = 3864^2 + 1889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18498817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18498811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249408 + 9249409.

It is an arithmetic number, because the mean of its divisors is an integer number (9249409).

Almost surely, 2^18498817 is an apocalyptic number.

It is an amenable number.

18498817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18498817 is an equidigital number, since it uses as much as digits as its factorization.

18498817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 46.

The square root of 18498817 is about 4301.0251103661. The cubic root of 18498817 is about 264.4729860693.

The spelling of 18498817 in words is "eighteen million, four hundred ninety-eight thousand, eight hundred seventeen".