15889920 has 80 divisors (see below), whose sum is σ = 50822640. Its totient is φ = 4235264.

The previous prime is 15889903. The next prime is 15889931. The reversal of 15889920 is 2998851.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6646 + ... + 8714.

It is an arithmetic number, because the mean of its divisors is an integer number (635283).

Almost surely, 2^15889920 is an apocalyptic number.

15889920 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 15889920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25411320).

15889920 is an abundant number, since it is smaller than the sum of its proper divisors (34932720).

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

15889920 is an equidigital number, since it uses as much as digits as its factorization.

15889920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 2079 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 15889920 is about 3986.2162510331. The cubic root of 15889920 is about 251.4049958217.

The spelling of 15889920 in words is "fifteen million, eight hundred eighty-nine thousand, nine hundred twenty".