2109620 has 24 divisors (see below), whose sum is σ = 4457544. Its totient is φ = 838656.

The previous prime is 2109619. The next prime is 2109641. The reversal of 2109620 is 269012.

It can be written as a sum of positive squares in 4 ways, for example, as 47524 + 2062096 = 218^2 + 1436^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2109592 and 2109601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6092 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (185731).

2^2109620 is an apocalyptic number.

2109620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2109620 is an abundant number, since it is smaller than the sum of its proper divisors (2347924).

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

2109620 is a wasteful number, since it uses less digits than its factorization.

2109620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2109620 is about 1452.4530973494. The cubic root of 2109620 is about 128.2531610720.

The spelling of 2109620 in words is "two million, one hundred nine thousand, six hundred twenty".