13638173 has 2 divisors, whose sum is σ = 13638174. Its totient is φ = 13638172.

The previous prime is 13638161. The next prime is 13638179. The reversal of 13638173 is 37183631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13344409 + 293764 = 3653^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 13638173 - 2¹⁴ = 13621789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13638179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819086 + 6819087.

It is an arithmetic number, because the mean of its divisors is an integer number (6819087).

Almost surely, 2^13638173 is an apocalyptic number.

It is an amenable number.

13638173 is a deficient number, since it is larger than the sum of its proper divisors (1).

13638173 is an equidigital number, since it uses as much as digits as its factorization.

13638173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 13638173 is about 3692.9897102483. The cubic root of 13638173 is about 238.9197573796.

The spelling of 13638173 in words is "thirteen million, six hundred thirty-eight thousand, one hundred seventy-three".