13909686 has 16 divisors (see below), whose sum is σ = 31793664. Its totient is φ = 3974184.

The previous prime is 13909673. The next prime is 13909699. The reversal of 13909686 is 68690931.

It is an interprime number because it is at equal distance from previous prime (13909673) and next prime (13909699).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 331183 = 13909686 / (1 + 3 + 9 + 0 + 9 + 6 + 8 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165550 + ... + 165633.

It is an arithmetic number, because the mean of its divisors is an integer number (1987104).

Almost surely, 2^13909686 is an apocalyptic number.

13909686 is an abundant number, since it is smaller than the sum of its proper divisors (17883978).

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

13909686 is a wasteful number, since it uses less digits than its factorization.

13909686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331195.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 13909686 is about 3729.5691440165. The cubic root of 13909686 is about 240.4948470476.

The spelling of 13909686 in words is "thirteen million, nine hundred nine thousand, six hundred eighty-six".