13659640 has 16 divisors (see below), whose sum is σ = 30734280. Its totient is φ = 5463840.

The previous prime is 13659629. The next prime is 13659641. The reversal of 13659640 is 4695631.

It is a junction number, because it is equal to n+sod(n) for n = 13659596 and 13659605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13659641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170706 + ... + 170785.

Almost surely, 2^13659640 is an apocalyptic number.

13659640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13659640 is an abundant number, since it is smaller than the sum of its proper divisors (17074640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13659640 is a wasteful number, since it uses less digits than its factorization.

13659640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341502 (or 341498 counting only the distinct ones).

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

The square root of 13659640 is about 3695.8950201541. The cubic root of 13659640 is about 239.0450479094.

The spelling of 13659640 in words is "thirteen million, six hundred fifty-nine thousand, six hundred forty".