13981015 has 4 divisors (see below), whose sum is σ = 16777224. Its totient is φ = 11184808.

The previous prime is 13981013. The next prime is 13981027. The reversal of 13981015 is 51018931.

13981015 is nontrivially palindromic in base 4.

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 13981015 - 2¹ = 13981013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13981013) 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, 1398097 + ... + 1398106.

It is an arithmetic number, because the mean of its divisors is an integer number (4194306).

Almost surely, 2^13981015 is an apocalyptic number.

13981015 is a deficient number, since it is larger than the sum of its proper divisors (2796209).

13981015 is an equidigital number, since it uses as much as digits as its factorization.

13981015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796208.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 13981015 is about 3739.1195487708. The cubic root of 13981015 is about 240.9052329663.

Adding to 13981015 its reverse (51018931), we get a palindrome (64999946).

The spelling of 13981015 in words is "thirteen million, nine hundred eighty-one thousand, fifteen".