2189720 has 32 divisors (see below), whose sum is σ = 5307120. Its totient is φ = 808320.

The previous prime is 2189713. The next prime is 2189723. The reversal of 2189720 is 279812.

2189720 = T₁₅₁ + T₁₅₂ + ... + T₂₅₄.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586 + ... + 2625.

2^2189720 is an apocalyptic number.

2189720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2189720 is an abundant number, since it is smaller than the sum of its proper divisors (3117400).

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

2189720 is a wasteful number, since it uses less digits than its factorization.

2189720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235 (or 4231 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2189720 is about 1479.7702524379. The cubic root of 2189720 is about 129.8562513637.

The spelling of 2189720 in words is "two million, one hundred eighty-nine thousand, seven hundred twenty".