2859209 has 4 divisors (see below), whose sum is σ = 2887620. Its totient is φ = 2830800.

The previous prime is 2859187. The next prime is 2859211. The reversal of 2859209 is 9029582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9029582 = 2 ⋅4514791.

It can be written as a sum of positive squares in 2 ways, for example, as 2131600 + 727609 = 1460^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 2859209 - 2¹² = 2855113 is a prime.

It is a super-2 number, since 2×2859209² = 16350152211362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2859229) 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, 14054 + ... + 14255.

It is an arithmetic number, because the mean of its divisors is an integer number (721905).

2^2859209 is an apocalyptic number.

It is an amenable number.

2859209 is a deficient number, since it is larger than the sum of its proper divisors (28411).

2859209 is a wasteful number, since it uses less digits than its factorization.

2859209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28410.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 2859209 is about 1690.9195723038. The cubic root of 2859209 is about 141.9325375505.

The spelling of 2859209 in words is "two million, eight hundred fifty-nine thousand, two hundred nine".