2809723 has 8 divisors (see below), whose sum is σ = 3322080. Its totient is φ = 2325120.

The previous prime is 2809717. The next prime is 2809727. The reversal of 2809723 is 3279082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2809723 - 2⁵ = 2809691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6718 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (415260).

2^2809723 is an apocalyptic number.

2809723 is a deficient number, since it is larger than the sum of its proper divisors (512357).

2809723 is a wasteful number, since it uses less digits than its factorization.

2809723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13877.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 2809723 is about 1676.2228372147. Note that the first 3 decimals coincide. The cubic root of 2809723 is about 141.1089311301.

The spelling of 2809723 in words is "two million, eight hundred nine thousand, seven hundred twenty-three".