2809873 has 4 divisors (see below), whose sum is σ = 3065328. Its totient is φ = 2554420.

The previous prime is 2809867. The next prime is 2809883. The reversal of 2809873 is 3789082.

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 not a de Polignac number, because 2809873 - 2¹³ = 2801681 is a prime.

It is a super-2 number, since 2×2809873² = 15790772552258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2809813) 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, 127711 + ... + 127732.

It is an arithmetic number, because the mean of its divisors is an integer number (766332).

2^2809873 is an apocalyptic number.

It is an amenable number.

2809873 is a deficient number, since it is larger than the sum of its proper divisors (255455).

2809873 is a wasteful number, since it uses less digits than its factorization.

2809873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255454.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 2809873 is about 1676.2675800719. The cubic root of 2809873 is about 141.1114421680. Note that the first 3 decimals are identical.

It can be divided in two parts, 280 and 9873, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 2809873 in words is "two million, eight hundred nine thousand, eight hundred seventy-three".