13621723 has 2 divisors, whose sum is σ = 13621724. Its totient is φ = 13621722.

The previous prime is 13621697. The next prime is 13621753. The reversal of 13621723 is 32712631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13621723 - 2⁵ = 13621691 is a prime.

It is not a weakly prime, because it can be changed into another prime (13621753) 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, 6810861 + 6810862.

It is an arithmetic number, because the mean of its divisors is an integer number (6810862).

Almost surely, 2^13621723 is an apocalyptic number.

13621723 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621723 is an equidigital number, since it uses as much as digits as its factorization.

13621723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 13621723 is about 3690.7618454731. The cubic root of 13621723 is about 238.8236591889.

The spelling of 13621723 in words is "thirteen million, six hundred twenty-one thousand, seven hundred twenty-three".