13640659 has 4 divisors (see below), whose sum is σ = 13973400. Its totient is φ = 13307920.

The previous prime is 13640639. The next prime is 13640677. The reversal of 13640659 is 95604631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13640659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13640609) 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, 166309 + ... + 166390.

It is an arithmetic number, because the mean of its divisors is an integer number (3493350).

Almost surely, 2^13640659 is an apocalyptic number.

13640659 is a deficient number, since it is larger than the sum of its proper divisors (332741).

13640659 is an equidigital number, since it uses as much as digits as its factorization.

13640659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332740.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 13640659 is about 3693.3262785733. The cubic root of 13640659 is about 238.9342734596.

The spelling of 13640659 in words is "thirteen million, six hundred forty thousand, six hundred fifty-nine".