16209940 has 48 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 6131840.

The previous prime is 16209923. The next prime is 16209953. The reversal of 16209940 is 4990261.

It is a happy number.

16209940 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 15 ways as a sum of consecutive naturals, for example, 60126 + ... + 60394.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^16209940 is an apocalyptic number.

16209940 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 16209940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17962560).

16209940 is an abundant number, since it is smaller than the sum of its proper divisors (19715180).

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

16209940 is a wasteful number, since it uses less digits than its factorization.

16209940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16209940 is about 4026.1569765721. The cubic root of 16209940 is about 253.0815403719.

The spelling of 16209940 in words is "sixteen million, two hundred nine thousand, nine hundred forty".