2099640 has 32 divisors (see below), whose sum is σ = 6299280. Its totient is φ = 559872.

The previous prime is 2099627. The next prime is 2099641. The reversal of 2099640 is 469902.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a d-powerful number, because it can be written as 2²¹ + 0 + 9³ + 9³ + 6 + 4⁵ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 2099598 and 2099607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099641) by changing a digit.

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, 8629 + ... + 8868.

2^2099640 is an apocalyptic number.

2099640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2099640 is an abundant number, since it is smaller than the sum of its proper divisors (4199640).

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

2099640 is a wasteful number, since it uses less digits than its factorization.

2099640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17511 (or 17507 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 2099640 is about 1449.0134574944. The cubic root of 2099640 is about 128.0505984853.

The spelling of 2099640 in words is "two million, ninety-nine thousand, six hundred forty".