2099969 has 4 divisors (see below), whose sum is σ = 2191296. Its totient is φ = 2008644.

The previous prime is 2099963. The next prime is 2100001. The reversal of 2099969 is 9699902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9699902 = 2 ⋅4849951.

It is a cyclic number.

It is not a de Polignac number, because 2099969 - 2¹⁶ = 2034433 is a prime.

It is a super-2 number, since 2×2099969² = 8819739601922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45629 + ... + 45674.

It is an arithmetic number, because the mean of its divisors is an integer number (547824).

2^2099969 is an apocalyptic number.

It is an amenable number.

2099969 is a deficient number, since it is larger than the sum of its proper divisors (91327).

2099969 is an equidigital number, since it uses as much as digits as its factorization.

2099969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91326.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 2099969 is about 1449.1269785633. The cubic root of 2099969 is about 128.0572863694.

The spelling of 2099969 in words is "two million, ninety-nine thousand, nine hundred sixty-nine".