18713297 has 2 divisors, whose sum is σ = 18713298. Its totient is φ = 18713296.

The previous prime is 18713291. The next prime is 18713327. The reversal of 18713297 is 79231781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 59536 = 4319^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 18713297 - 2⁴ = 18713281 is a prime.

It is a super-2 number, since 2×18713297² = 700374969220418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18713297.

It is not a weakly prime, because it can be changed into another prime (18713291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9356648 + 9356649.

It is an arithmetic number, because the mean of its divisors is an integer number (9356649).

Almost surely, 2^18713297 is an apocalyptic number.

It is an amenable number.

18713297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18713297 is an equidigital number, since it uses as much as digits as its factorization.

18713297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 18713297 is about 4325.8868454919. The cubic root of 18713297 is about 265.4911834761.

The spelling of 18713297 in words is "eighteen million, seven hundred thirteen thousand, two hundred ninety-seven".