13399920 has 120 divisors (see below), whose sum is σ = 46309536. Its totient is φ = 3469824.

The previous prime is 13399889. The next prime is 13399949. The reversal of 13399920 is 2999331.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

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 23 ways as a sum of consecutive naturals, for example, 26389 + ... + 26891.

Almost surely, 2^13399920 is an apocalyptic number.

13399920 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 13399920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23154768).

13399920 is an abundant number, since it is smaller than the sum of its proper divisors (32909616).

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

13399920 is a wasteful number, since it uses less digits than its factorization.

13399920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 13399920 is about 3660.5901163610. The cubic root of 13399920 is about 237.5203011271.

The spelling of 13399920 in words is "thirteen million, three hundred ninety-nine thousand, nine hundred twenty".