13639693 has 2 divisors, whose sum is σ = 13639694. Its totient is φ = 13639692.

The previous prime is 13639651. The next prime is 13639697. The reversal of 13639693 is 39693631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13638249 + 1444 = 3693^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 13639693 - 2⁹ = 13639181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13639697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819846 + 6819847.

It is an arithmetic number, because the mean of its divisors is an integer number (6819847).

Almost surely, 2^13639693 is an apocalyptic number.

It is an amenable number.

13639693 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639693 is an equidigital number, since it uses as much as digits as its factorization.

13639693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 40.

The square root of 13639693 is about 3693.1954998348. The cubic root of 13639693 is about 238.9286330685.

The spelling of 13639693 in words is "thirteen million, six hundred thirty-nine thousand, six hundred ninety-three".