13739657 has 4 divisors (see below), whose sum is σ = 13754436. Its totient is φ = 13724880.

The previous prime is 13739639. The next prime is 13739659. The reversal of 13739657 is 75693731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75693731 = 3593 ⋅21067.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 3728761 = 3164^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 13739657 - 2¹⁰ = 13738633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13739659) 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 in 3 ways as a sum of consecutive naturals, for example, 5894 + ... + 7887.

It is an arithmetic number, because the mean of its divisors is an integer number (3438609).

Almost surely, 2^13739657 is an apocalyptic number.

It is an amenable number.

13739657 is a deficient number, since it is larger than the sum of its proper divisors (14779).

13739657 is an equidigital number, since it uses as much as digits as its factorization.

13739657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14778.

The product of its digits is 119070, while the sum is 41.

The square root of 13739657 is about 3706.7043313434. The cubic root of 13739657 is about 239.5109078994.

The spelling of 13739657 in words is "thirteen million, seven hundred thirty-nine thousand, six hundred fifty-seven".