13993971 has 4 divisors (see below), whose sum is σ = 18658632. Its totient is φ = 9329312.

The previous prime is 13993951. The next prime is 13993999. The reversal of 13993971 is 17939931.

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

It is a cyclic number.

It is not a de Polignac number, because 13993971 - 2⁵ = 13993939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13993951) 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, 2332326 + ... + 2332331.

It is an arithmetic number, because the mean of its divisors is an integer number (4664658).

Almost surely, 2^13993971 is an apocalyptic number.

13993971 is a deficient number, since it is larger than the sum of its proper divisors (4664661).

13993971 is an equidigital number, since it uses as much as digits as its factorization.

13993971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664660.

The product of its digits is 45927, while the sum is 42.

The square root of 13993971 is about 3740.8516410037. The cubic root of 13993971 is about 240.9796244317.

The spelling of 13993971 in words is "thirteen million, nine hundred ninety-three thousand, nine hundred seventy-one".