2189940 has 96 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 516096.

The previous prime is 2189939. The next prime is 2189981. The reversal of 2189940 is 499812.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 19324 + ... + 19436.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2^2189940 is an apocalyptic number.

2189940 is a gapful number since it is divisible by the number (20) 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 2189940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3447360).

2189940 is an abundant number, since it is smaller than the sum of its proper divisors (4704780).

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

2189940 is a wasteful number, since it uses less digits than its factorization.

2189940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2189940 is about 1479.8445864347. The cubic root of 2189940 is about 129.8606000808.

The spelling of 2189940 in words is "two million, one hundred eighty-nine thousand, nine hundred forty".