13644457 has 2 divisors, whose sum is σ = 13644458. Its totient is φ = 13644456.

The previous prime is 13644443. The next prime is 13644461. The reversal of 13644457 is 75444631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9884736 + 3759721 = 3144^2 + 1939^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644457 - 2⁷ = 13644329 is a prime.

It is not a weakly prime, because it can be changed into another prime (13644427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822228 + 6822229.

It is an arithmetic number, because the mean of its divisors is an integer number (6822229).

Almost surely, 2^13644457 is an apocalyptic number.

It is an amenable number.

13644457 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644457 is an equidigital number, since it uses as much as digits as its factorization.

13644457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 34.

The square root of 13644457 is about 3693.8404134451. The cubic root of 13644457 is about 238.9564470745.

The spelling of 13644457 in words is "thirteen million, six hundred forty-four thousand, four hundred fifty-seven".