18672517 has 2 divisors, whose sum is σ = 18672518. Its totient is φ = 18672516.

The previous prime is 18672499. The next prime is 18672541. The reversal of 18672517 is 71527681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 982081 = 4206^2 + 991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18672517 is a prime.

It is a super-2 number, since 2×18672517² = 697325782230578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18672587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336258 + 9336259.

It is an arithmetic number, because the mean of its divisors is an integer number (9336259).

Almost surely, 2^18672517 is an apocalyptic number.

It is an amenable number.

18672517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18672517 is an equidigital number, since it uses as much as digits as its factorization.

18672517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 37.

The square root of 18672517 is about 4321.1707904224. The cubic root of 18672517 is about 265.2981905020.

The spelling of 18672517 in words is "eighteen million, six hundred seventy-two thousand, five hundred seventeen".