2102689 has 4 divisors (see below), whose sum is σ = 2110720. Its totient is φ = 2094660.

The previous prime is 2102687. The next prime is 2102693. The reversal of 2102689 is 9862012.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2102689 - 2¹ = 2102687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102687) 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 3 ways as a sum of consecutive naturals, for example, 3609 + ... + 4150.

It is an arithmetic number, because the mean of its divisors is an integer number (527680).

2^2102689 is an apocalyptic number.

It is an amenable number.

2102689 is a deficient number, since it is larger than the sum of its proper divisors (8031).

2102689 is an equidigital number, since it uses as much as digits as its factorization.

2102689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8030.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2102689 is about 1450.0651709492. The cubic root of 2102689 is about 128.1125515568.

It can be divided in two parts, 21026 and 89, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 2102689 in words is "two million, one hundred two thousand, six hundred eighty-nine".