13639694 has 4 divisors (see below), whose sum is σ = 20459544. Its totient is φ = 6819846.

The previous prime is 13639693. The next prime is 13639697. The reversal of 13639694 is 49693631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49693631 = 13 ⋅3822587.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639693) 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, 3409922 + ... + 3409925.

It is an arithmetic number, because the mean of its divisors is an integer number (5114886).

Almost surely, 2^13639694 is an apocalyptic number.

13639694 is a deficient number, since it is larger than the sum of its proper divisors (6819850).

13639694 is an equidigital number, since it uses as much as digits as its factorization.

13639694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6819849.

The product of its digits is 104976, while the sum is 41.

The square root of 13639694 is about 3693.1956352189. The cubic root of 13639694 is about 238.9286389075.

The spelling of 13639694 in words is "thirteen million, six hundred thirty-nine thousand, six hundred ninety-four".