13979993 has 4 divisors (see below), whose sum is σ = 14007348. Its totient is φ = 13952640.

The previous prime is 13979983. The next prime is 13980047. The reversal of 13979993 is 39997931.

It is a happy number.

13979993 is digitally balanced in base 2, because in such base 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: 39997931 = 29 ⋅1379239.

It can be written as a sum of positive squares in 2 ways, for example, as 2474329 + 11505664 = 1573^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 13979993 - 2¹⁰ = 13978969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13979923) 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, 12896 + ... + 13937.

It is an arithmetic number, because the mean of its divisors is an integer number (3501837).

Almost surely, 2^13979993 is an apocalyptic number.

It is an amenable number.

13979993 is a deficient number, since it is larger than the sum of its proper divisors (27355).

13979993 is an equidigital number, since it uses as much as digits as its factorization.

13979993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27354.

The product of its digits is 413343, while the sum is 50.

The square root of 13979993 is about 3738.9828830846. The cubic root of 13979993 is about 240.8993628358.

The spelling of 13979993 in words is "thirteen million, nine hundred seventy-nine thousand, nine hundred ninety-three".