13639697 has 2 divisors, whose sum is σ = 13639698. Its totient is φ = 13639696.

The previous prime is 13639693. The next prime is 13639727. The reversal of 13639697 is 79693631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13608721 + 30976 = 3689^2 + 176^2 .

It is an emirp because it is prime and its reverse (79693631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13639697 - 2² = 13639693 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13639693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819848 + 6819849.

It is an arithmetic number, because the mean of its divisors is an integer number (6819849).

Almost surely, 2^13639697 is an apocalyptic number.

It is an amenable number.

13639697 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639697 is an equidigital number, since it uses as much as digits as its factorization.

13639697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 44.

The square root of 13639697 is about 3693.1960413712. The cubic root of 13639697 is about 238.9286564247.

The spelling of 13639697 in words is "thirteen million, six hundred thirty-nine thousand, six hundred ninety-seven".