16661940 has 48 divisors (see below), whose sum is σ = 47017152. Its totient is φ = 4408576.

The previous prime is 16661927. The next prime is 16661971. The reversal of 16661940 is 4916661.

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, 7207 + ... + 9233.

It is an arithmetic number, because the mean of its divisors is an integer number (979524).

Almost surely, 2^16661940 is an apocalyptic number.

16661940 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 16661940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23508576).

16661940 is an abundant number, since it is smaller than the sum of its proper divisors (30355212).

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

16661940 is a wasteful number, since it uses less digits than its factorization.

16661940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176 (or 2174 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 16661940 is about 4081.9039675132. The cubic root of 16661940 is about 255.4123279198.

The spelling of 16661940 in words is "sixteen million, six hundred sixty-one thousand, nine hundred forty".