13999920 has 80 divisors (see below), whose sum is σ = 47354112. Its totient is φ = 3393280.

The previous prime is 13999919. The next prime is 13999957. The reversal of 13999920 is 2999931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 12 + ... + 5291.

Almost surely, 2^13999920 is an apocalyptic number.

13999920 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 13999920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23677056).

13999920 is an abundant number, since it is smaller than the sum of its proper divisors (33354192).

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

13999920 is a wasteful number, since it uses less digits than its factorization.

13999920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330 (or 5324 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 13999920 is about 3741.6466963090. The cubic root of 13999920 is about 241.0137673419.

The spelling of 13999920 in words is "thirteen million, nine hundred ninety-nine thousand, nine hundred twenty".