16309980 has 108 divisors (see below), whose sum is σ = 52422552. Its totient is φ = 4104000.

The previous prime is 16309973. The next prime is 16310009. The reversal of 16309980 is 8990361.

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 35 ways as a sum of consecutive naturals, for example, 64855 + ... + 65105.

It is an arithmetic number, because the mean of its divisors is an integer number (485394).

Almost surely, 2^16309980 is an apocalyptic number.

16309980 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 16309980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26211276).

16309980 is an abundant number, since it is smaller than the sum of its proper divisors (36112572).

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

16309980 is a wasteful number, since it uses less digits than its factorization.

16309980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 16309980 is about 4038.5616251334. The cubic root of 16309980 is about 253.6011057547.

The spelling of 16309980 in words is "sixteen million, three hundred nine thousand, nine hundred eighty".