13644739 has 2 divisors, whose sum is σ = 13644740. Its totient is φ = 13644738.

The previous prime is 13644733. The next prime is 13644769. The reversal of 13644739 is 93744631.

It is a weak prime.

It is an emirp because it is prime and its reverse (93744631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13644739 - 2³ = 13644731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13644698 and 13644707.

It is not a weakly prime, because it can be changed into another prime (13644731) 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 as a sum of consecutive naturals, namely, 6822369 + 6822370.

It is an arithmetic number, because the mean of its divisors is an integer number (6822370).

Almost surely, 2^13644739 is an apocalyptic number.

13644739 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644739 is an equidigital number, since it uses as much as digits as its factorization.

13644739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 13644739 is about 3693.8785849023. The cubic root of 13644739 is about 238.9580932926.

The spelling of 13644739 in words is "thirteen million, six hundred forty-four thousand, seven hundred thirty-nine".