2099689 has 4 divisors (see below), whose sum is σ = 2120580. Its totient is φ = 2078800.

The previous prime is 2099677. The next prime is 2099707. The reversal of 2099689 is 9869902.

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 1946025 + 153664 = 1395^2 + 392^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099689 - 2¹³ = 2091497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099659) 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, 10294 + ... + 10495.

It is an arithmetic number, because the mean of its divisors is an integer number (530145).

2^2099689 is an apocalyptic number.

It is an amenable number.

2099689 is a deficient number, since it is larger than the sum of its proper divisors (20891).

2099689 is a wasteful number, since it uses less digits than its factorization.

2099689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20890.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 2099689 is about 1449.0303654513. The cubic root of 2099689 is about 128.0515945974.

The spelling of 2099689 in words is "two million, ninety-nine thousand, six hundred eighty-nine".