13021986 has 32 divisors (see below), whose sum is σ = 27368640. Its totient is φ = 4124736.

The previous prime is 13021927. The next prime is 13021993. The reversal of 13021986 is 68912031.

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 15 ways as a sum of consecutive naturals, for example, 11100 + ... + 12216.

It is an arithmetic number, because the mean of its divisors is an integer number (855270).

Almost surely, 2^13021986 is an apocalyptic number.

13021986 is an abundant number, since it is smaller than the sum of its proper divisors (14346654).

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

13021986 is a wasteful number, since it uses less digits than its factorization.

13021986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 13021986 is about 3608.5988970790. The cubic root of 13021986 is about 235.2659491009.

It can be divided in two parts, 130219 and 86, that added together give a triangular number (130305 = T₅₁₀).

The spelling of 13021986 in words is "thirteen million, twenty-one thousand, nine hundred eighty-six".