14991986 has 4 divisors (see below), whose sum is σ = 22487982. Its totient is φ = 7495992.

The previous prime is 14991973. The next prime is 14991997. The reversal of 14991986 is 68919941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68919941 = 4289 ⋅16069.

It can be written as a sum of positive squares in only one way, i.e., 10686361 + 4305625 = 3269^2 + 2075^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 14991986.

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, 3747995 + ... + 3747998.

Almost surely, 2^14991986 is an apocalyptic number.

14991986 is a deficient number, since it is larger than the sum of its proper divisors (7495996).

14991986 is an equidigital number, since it uses as much as digits as its factorization.

14991986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7495995.

The product of its digits is 139968, while the sum is 47.

The square root of 14991986 is about 3871.9486050308. The cubic root of 14991986 is about 246.5772791122.

The spelling of 14991986 in words is "fourteen million, nine hundred ninety-one thousand, nine hundred eighty-six".