13644491 has 6 divisors (see below), whose sum is σ = 15872220. Its totient is φ = 11695236.

The previous prime is 13644473. The next prime is 13644539. The reversal of 13644491 is 19444631.

It is a happy number.

It is not a de Polignac number, because 13644491 - 2⁶ = 13644427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13644461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139181 + ... + 139278.

It is an arithmetic number, because the mean of its divisors is an integer number (2645370).

Almost surely, 2^13644491 is an apocalyptic number.

13644491 is a deficient number, since it is larger than the sum of its proper divisors (2227729).

13644491 is an equidigital number, since it uses as much as digits as its factorization.

13644491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278473 (or 278466 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 13644491 is about 3693.8450156984. The cubic root of 13644491 is about 238.9566455559.

The spelling of 13644491 in words is "thirteen million, six hundred forty-four thousand, four hundred ninety-one".