13947691 has 8 divisors (see below), whose sum is σ = 14720400. Its totient is φ = 13178880.

The previous prime is 13947671. The next prime is 13947697. The reversal of 13947691 is 19674931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13947691 - 2¹¹ = 13945643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13947697) 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 7 ways as a sum of consecutive naturals, for example, 9195 + ... + 10603.

It is an arithmetic number, because the mean of its divisors is an integer number (1840050).

Almost surely, 2^13947691 is an apocalyptic number.

13947691 is a deficient number, since it is larger than the sum of its proper divisors (772709).

13947691 is a wasteful number, since it uses less digits than its factorization.

13947691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949.

The product of its digits is 40824, while the sum is 40.

The square root of 13947691 is about 3734.6607610331. The cubic root of 13947691 is about 240.7136800478.

The spelling of 13947691 in words is "thirteen million, nine hundred forty-seven thousand, six hundred ninety-one".