2109720 has 32 divisors (see below), whose sum is σ = 6329520. Its totient is φ = 562560.

The previous prime is 2109707. The next prime is 2109727. The reversal of 2109720 is 279012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109727) 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, 8671 + ... + 8910.

2^2109720 is an apocalyptic number.

2109720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2109720 is an abundant number, since it is smaller than the sum of its proper divisors (4219800).

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

2109720 is a wasteful number, since it uses less digits than its factorization.

2109720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17595 (or 17591 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 2109720 is about 1452.4875214610. The cubic root of 2109720 is about 128.2551875212.

The spelling of 2109720 in words is "two million, one hundred nine thousand, seven hundred twenty".