13623917 has 4 divisors (see below), whose sum is σ = 13810620. Its totient is φ = 13437216.

The previous prime is 13623901. The next prime is 13623943. The reversal of 13623917 is 71932631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71932631 = 2777 ⋅25903.

It can be written as a sum of positive squares in 2 ways, for example, as 5248681 + 8375236 = 2291^2 + 2894^2 .

It is a cyclic number.

It is not a de Polignac number, because 13623917 - 2⁴ = 13623901 is a prime.

It is a super-2 number, since 2×13623917² = 371222228845778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13623017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93242 + ... + 93387.

It is an arithmetic number, because the mean of its divisors is an integer number (3452655).

Almost surely, 2^13623917 is an apocalyptic number.

It is an amenable number.

13623917 is a deficient number, since it is larger than the sum of its proper divisors (186703).

13623917 is an equidigital number, since it uses as much as digits as its factorization.

13623917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186702.

The product of its digits is 6804, while the sum is 32.

The square root of 13623917 is about 3691.0590621121. The cubic root of 13623917 is about 238.8364806452.

The spelling of 13623917 in words is "thirteen million, six hundred twenty-three thousand, nine hundred seventeen".