2273809 has 4 divisors (see below), whose sum is σ = 2283120. Its totient is φ = 2264500.

The previous prime is 2273807. The next prime is 2273827. The reversal of 2273809 is 9083722.

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 2273809 - 2¹ = 2273807 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2273809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2273807) 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, 4279 + ... + 4780.

It is an arithmetic number, because the mean of its divisors is an integer number (570780).

2^2273809 is an apocalyptic number.

It is an amenable number.

2273809 is a deficient number, since it is larger than the sum of its proper divisors (9311).

2273809 is an equidigital number, since it uses as much as digits as its factorization.

2273809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310.

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

The square root of 2273809 is about 1507.9154485580. The cubic root of 2273809 is about 131.4976506397.

Subtracting from 2273809 its sum of digits (31), we obtain a triangular number (2273778 = T₂₁₃₂).

The spelling of 2273809 in words is "two million, two hundred seventy-three thousand, eight hundred nine".