13908649 has 4 divisors (see below), whose sum is σ = 13922820. Its totient is φ = 13894480.

The previous prime is 13908641. The next prime is 13908667. The reversal of 13908649 is 94680931.

13908649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7252249 + 6656400 = 2693^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 13908649 - 2³ = 13908641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13908641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5494 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (3480705).

Almost surely, 2^13908649 is an apocalyptic number.

It is an amenable number.

13908649 is a deficient number, since it is larger than the sum of its proper divisors (14171).

13908649 is a wasteful number, since it uses less digits than its factorization.

13908649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 13908649 is about 3729.4301173236. The cubic root of 13908649 is about 240.4888704125.

The spelling of 13908649 in words is "thirteen million, nine hundred eight thousand, six hundred forty-nine".