16389720 has 96 divisors (see below), whose sum is σ = 54334800. Its totient is φ = 4283136.

The previous prime is 16389713. The next prime is 16389733. The reversal of 16389720 is 2798361.

16389720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18651 + ... + 19509.

Almost surely, 2^16389720 is an apocalyptic number.

16389720 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 16389720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27167400).

16389720 is an abundant number, since it is smaller than the sum of its proper divisors (37945080).

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

16389720 is a wasteful number, since it uses less digits than its factorization.

16389720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 16389720 is about 4048.4219147712. The cubic root of 16389720 is about 254.0137219528.

The spelling of 16389720 in words is "sixteen million, three hundred eighty-nine thousand, seven hundred twenty".