13621823 has 2 divisors, whose sum is σ = 13621824. Its totient is φ = 13621822.

The previous prime is 13621801. The next prime is 13621831. The reversal of 13621823 is 32812631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13621823 - 2²⁰ = 12573247 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 13621792 and 13621801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13621123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810911 + 6810912.

It is an arithmetic number, because the mean of its divisors is an integer number (6810912).

Almost surely, 2^13621823 is an apocalyptic number.

13621823 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621823 is an equidigital number, since it uses as much as digits as its factorization.

13621823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 13621823 is about 3690.7753927867. The cubic root of 13621823 is about 238.8242436061.

The spelling of 13621823 in words is "thirteen million, six hundred twenty-one thousand, eight hundred twenty-three".