13999680 has 84 divisors (see below), whose sum is σ = 48162972. Its totient is φ = 3732480.

The previous prime is 13999673. The next prime is 13999691. The reversal of 13999680 is 8699931.

It can be written as a sum of positive squares in 2 ways, for example, as 9437184 + 4562496 = 3072^2 + 2136^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 450 + ... + 5310.

Almost surely, 2^13999680 is an apocalyptic number.

13999680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13999680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24081486).

13999680 is an abundant number, since it is smaller than the sum of its proper divisors (34163292).

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

13999680 is a wasteful number, since it uses less digits than its factorization.

13999680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4884 (or 4871 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 13999680 is about 3741.6146247309. The cubic root of 13999680 is about 241.0123901047.

The spelling of 13999680 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred eighty".