13661986 has 8 divisors (see below), whose sum is σ = 22069404. Its totient is φ = 6305520.

The previous prime is 13661971. The next prime is 13662013. The reversal of 13661986 is 68916631.

It can be written as a sum of positive squares in 2 ways, for example, as 13549761 + 112225 = 3681^2 + 335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13661986² = 373299722928392, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 262705 + ... + 262756.

Almost surely, 2^13661986 is an apocalyptic number.

13661986 is a deficient number, since it is larger than the sum of its proper divisors (8407418).

13661986 is a wasteful number, since it uses less digits than its factorization.

13661986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525476.

The product of its digits is 46656, while the sum is 40.

The square root of 13661986 is about 3696.2123856727. The cubic root of 13661986 is about 239.0587322031.

The spelling of 13661986 in words is "thirteen million, six hundred sixty-one thousand, nine hundred eighty-six".