13980905 has 4 divisors (see below), whose sum is σ = 16777092. Its totient is φ = 11184720.

The previous prime is 13980881. The next prime is 13980913. The reversal of 13980905 is 50908931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50908931 = 17 ⋅2994643.

It can be written as a sum of positive squares in 2 ways, for example, as 4932841 + 9048064 = 2221^2 + 3008^2 .

It is not a de Polignac number, because 13980905 - 2¹⁴ = 13964521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1398086 + ... + 1398095.

It is an arithmetic number, because the mean of its divisors is an integer number (4194273).

Almost surely, 2^13980905 is an apocalyptic number.

It is an amenable number.

13980905 is a deficient number, since it is larger than the sum of its proper divisors (2796187).

13980905 is an equidigital number, since it uses as much as digits as its factorization.

13980905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796186.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 13980905 is about 3739.1048393967. The cubic root of 13980905 is about 240.9046011656.

The spelling of 13980905 in words is "thirteen million, nine hundred eighty thousand, nine hundred five".