13443986 has 4 divisors (see below), whose sum is σ = 20165982. Its totient is φ = 6721992.

The previous prime is 13443979. The next prime is 13444007. The reversal of 13443986 is 68934431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68934431 = 1289 ⋅53479.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 3171961 = 3205^2 + 1781^2 .

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 as a sum of consecutive naturals, namely, 3360995 + ... + 3360998.

Almost surely, 2^13443986 is an apocalyptic number.

13443986 is a deficient number, since it is larger than the sum of its proper divisors (6721996).

13443986 is an equidigital number, since it uses as much as digits as its factorization.

13443986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6721995.

The product of its digits is 62208, while the sum is 38.

The square root of 13443986 is about 3666.6041509822. The cubic root of 13443986 is about 237.7803802247.

The spelling of 13443986 in words is "thirteen million, four hundred forty-three thousand, nine hundred eighty-six".