13638623 has 2 divisors, whose sum is σ = 13638624. Its totient is φ = 13638622.

The previous prime is 13638593. The next prime is 13638629. The reversal of 13638623 is 32683631.

It is a strong prime.

It is an emirp because it is prime and its reverse (32683631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13638623 - 2⁸ = 13638367 is a prime.

It is a super-2 number, since 2×13638623² = 372024074672258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13638623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13638629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819311 + 6819312.

It is an arithmetic number, because the mean of its divisors is an integer number (6819312).

Almost surely, 2^13638623 is an apocalyptic number.

13638623 is a deficient number, since it is larger than the sum of its proper divisors (1).

13638623 is an equidigital number, since it uses as much as digits as its factorization.

13638623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 13638623 is about 3693.0506359919. The cubic root of 13638623 is about 238.9223851194.

The spelling of 13638623 in words is "thirteen million, six hundred thirty-eight thousand, six hundred twenty-three".