13979281 has 4 divisors (see below), whose sum is σ = 14170852. Its totient is φ = 13787712.

The previous prime is 13979279. The next prime is 13979291. The reversal of 13979281 is 18297931.

13979281 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4000000 + 9979281 = 2000^2 + 3159^2 .

It is a cyclic number.

It is not a de Polignac number, because 13979281 - 2¹ = 13979279 is a prime.

It is a super-2 number, since 2×13979281² = 390840594553922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13979291) 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, 95676 + ... + 95821.

It is an arithmetic number, because the mean of its divisors is an integer number (3542713).

Almost surely, 2^13979281 is an apocalyptic number.

It is an amenable number.

13979281 is a deficient number, since it is larger than the sum of its proper divisors (191571).

13979281 is an equidigital number, since it uses as much as digits as its factorization.

13979281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191570.

The product of its digits is 27216, while the sum is 40.

The square root of 13979281 is about 3738.8876688127. The cubic root of 13979281 is about 240.8952731041.

The spelling of 13979281 in words is "thirteen million, nine hundred seventy-nine thousand, two hundred eighty-one".