13966989 has 4 divisors (see below), whose sum is σ = 18622656. Its totient is φ = 9311324.

The previous prime is 13966969. The next prime is 13966993. The reversal of 13966989 is 98966931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13966989 - 2¹¹ = 13964941 is a prime.

It is a super-2 number, since 2×13966989² = 390153563452242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13966949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2327829 + ... + 2327834.

It is an arithmetic number, because the mean of its divisors is an integer number (4655664).

Almost surely, 2^13966989 is an apocalyptic number.

It is an amenable number.

13966989 is a deficient number, since it is larger than the sum of its proper divisors (4655667).

13966989 is an equidigital number, since it uses as much as digits as its factorization.

13966989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4655666.

The product of its digits is 629856, while the sum is 51.

The square root of 13966989 is about 3737.2435029042. The cubic root of 13966989 is about 240.8246458900.

It can be divided in two parts, 1396 and 6989, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 13966989 in words is "thirteen million, nine hundred sixty-six thousand, nine hundred eighty-nine".