13999668 has 12 divisors (see below), whose sum is σ = 32665920. Its totient is φ = 4666552.

The previous prime is 13999651. The next prime is 13999673. The reversal of 13999668 is 86699931.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×13999668² = 391981408220448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13999668.

It is a congruent number.

It is an unprimeable number.

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, 583308 + ... + 583331.

It is an arithmetic number, because the mean of its divisors is an integer number (2722160).

Almost surely, 2^13999668 is an apocalyptic number.

It is an amenable number.

13999668 is an abundant number, since it is smaller than the sum of its proper divisors (18666252).

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

13999668 is a wasteful number, since it uses less digits than its factorization.

13999668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166646 (or 1166644 counting only the distinct ones).

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

The square root of 13999668 is about 3741.6130211448. The cubic root of 13999668 is about 241.0123212424.

The spelling of 13999668 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred sixty-eight".