2099645 has 4 divisors (see below), whose sum is σ = 2519580. Its totient is φ = 1679712.

The previous prime is 2099641. The next prime is 2099659. The reversal of 2099645 is 5469902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1666681 + 432964 = 1291^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099645 - 2² = 2099641 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 0 + 9³ + 9³ + 6 + 4⁵ + 5 .

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209960 + ... + 209969.

It is an arithmetic number, because the mean of its divisors is an integer number (629895).

2^2099645 is an apocalyptic number.

It is an amenable number.

2099645 is a deficient number, since it is larger than the sum of its proper divisors (419935).

2099645 is an equidigital number, since it uses as much as digits as its factorization.

2099645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419934.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2099645 is about 1449.0151828052. The cubic root of 2099645 is about 128.0507001301.

It can be divided in two parts, 2099 and 645, that added together give a cube (2744 = 14³).

The spelling of 2099645 in words is "two million, ninety-nine thousand, six hundred forty-five".