13999660 has 24 divisors (see below), whose sum is σ = 29470896. Its totient is φ = 5586240.

The previous prime is 13999651. The next prime is 13999673. The reversal of 13999660 is 6699931.

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 7 ways as a sum of consecutive naturals, for example, 13314 + ... + 14326.

It is an arithmetic number, because the mean of its divisors is an integer number (1227954).

Almost surely, 2^13999660 is an apocalyptic number.

13999660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13999660 is an abundant number, since it is smaller than the sum of its proper divisors (15471236).

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

13999660 is a wasteful number, since it uses less digits than its factorization.

13999660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713 (or 1711 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 13999660 is about 3741.6119520870. The cubic root of 13999660 is about 241.0122753342.

It can be divided in two parts, 139 and 99660, that added together give a palindrome (99799).

The spelling of 13999660 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred sixty".