13618729 has 2 divisors, whose sum is σ = 13618730. Its totient is φ = 13618728.

The previous prime is 13618699. The next prime is 13618747. The reversal of 13618729 is 92781631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7728400 + 5890329 = 2780^2 + 2427^2 .

It is a cyclic number.

It is not a de Polignac number, because 13618729 - 2⁵ = 13618697 is a prime.

It is not a weakly prime, because it can be changed into another prime (13618769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6809364 + 6809365.

It is an arithmetic number, because the mean of its divisors is an integer number (6809365).

Almost surely, 2^13618729 is an apocalyptic number.

It is an amenable number.

13618729 is a deficient number, since it is larger than the sum of its proper divisors (1).

13618729 is an equidigital number, since it uses as much as digits as its factorization.

13618729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 13618729 is about 3690.3562158686. The cubic root of 13618729 is about 238.8061604132.

The spelling of 13618729 in words is "thirteen million, six hundred eighteen thousand, seven hundred twenty-nine".