16389780 has 96 divisors (see below), whose sum is σ = 52738560. Its totient is φ = 3761280.

The previous prime is 16389757. The next prime is 16389797. The reversal of 16389780 is 8798361.

16389780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11887 + ... + 13193.

It is an arithmetic number, because the mean of its divisors is an integer number (549360).

Almost surely, 2^16389780 is an apocalyptic number.

16389780 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 16389780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26369280).

16389780 is an abundant number, since it is smaller than the sum of its proper divisors (36348780).

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

16389780 is a wasteful number, since it uses less digits than its factorization.

16389780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349 (or 1347 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 16389780 is about 4048.4293250593. The cubic root of 16389780 is about 254.0140319195.

The spelling of 16389780 in words is "sixteen million, three hundred eighty-nine thousand, seven hundred eighty".