13999971 has 8 divisors (see below), whose sum is σ = 18691344. Its totient is φ = 9320960.

The previous prime is 13999969. The next prime is 13999981. The reversal of 13999971 is 17999931.

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 13999971 - 2¹ = 13999969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13999971.

It is not an unprimeable number, because it can be changed into a prime (13999961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6 + ... + 5291.

It is an arithmetic number, because the mean of its divisors is an integer number (2336418).

Almost surely, 2^13999971 is an apocalyptic number.

13999971 is a deficient number, since it is larger than the sum of its proper divisors (4691373).

13999971 is an equidigital number, since it uses as much as digits as its factorization.

13999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181.

The product of its digits is 137781, while the sum is 48.

The square root of 13999971 is about 3741.6535114839. The cubic root of 13999971 is about 241.0140600028.

The spelling of 13999971 in words is "thirteen million, nine hundred ninety-nine thousand, nine hundred seventy-one".