13909649 has 4 divisors (see below), whose sum is σ = 14979636. Its totient is φ = 12839664.

The previous prime is 13909633. The next prime is 13909657. The reversal of 13909649 is 94690931.

13909649 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94690931 = 23 ⋅4116997.

It can be written as a sum of positive squares in 2 ways, for example, as 5313025 + 8596624 = 2305^2 + 2932^2 .

It is a cyclic number.

It is not a de Polignac number, because 13909649 - 2⁴ = 13909633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13909699) 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, 534974 + ... + 534999.

It is an arithmetic number, because the mean of its divisors is an integer number (3744909).

Almost surely, 2^13909649 is an apocalyptic number.

It is an amenable number.

13909649 is a deficient number, since it is larger than the sum of its proper divisors (1069987).

13909649 is a wasteful number, since it uses less digits than its factorization.

13909649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069986.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 13909649 is about 3729.5641836547. The cubic root of 13909649 is about 240.4946338073.

The spelling of 13909649 in words is "thirteen million, nine hundred nine thousand, six hundred forty-nine".