13985918 has 4 divisors (see below), whose sum is σ = 20978880. Its totient is φ = 6992958.

The previous prime is 13985911. The next prime is 13985927. The reversal of 13985918 is 81958931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81958931 = 83 ⋅987457.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13985911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3496478 + ... + 3496481.

It is an arithmetic number, because the mean of its divisors is an integer number (5244720).

Almost surely, 2^13985918 is an apocalyptic number.

13985918 is a deficient number, since it is larger than the sum of its proper divisors (6992962).

13985918 is an equidigital number, since it uses as much as digits as its factorization.

13985918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6992961.

The product of its digits is 77760, while the sum is 44.

The square root of 13985918 is about 3739.7751269294. The cubic root of 13985918 is about 240.9333906813.

The spelling of 13985918 in words is "thirteen million, nine hundred eighty-five thousand, nine hundred eighteen".