13987866 has 16 divisors (see below), whose sum is σ = 28504224. Its totient is φ = 4574544.

The previous prime is 13987843. The next prime is 13987877. The reversal of 13987866 is 66878931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21676 + ... + 22311.

It is an arithmetic number, because the mean of its divisors is an integer number (1781514).

Almost surely, 2^13987866 is an apocalyptic number.

13987866 is an abundant number, since it is smaller than the sum of its proper divisors (14516358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13987866 is a wasteful number, since it uses less digits than its factorization.

13987866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44045.

The product of its digits is 435456, while the sum is 48.

The square root of 13987866 is about 3740.0355613283. The cubic root of 13987866 is about 240.9445761336.

The spelling of 13987866 in words is "thirteen million, nine hundred eighty-seven thousand, eight hundred sixty-six".