2312309 has 4 divisors (see below), whose sum is σ = 2338380. Its totient is φ = 2286240.

The previous prime is 2312293. The next prime is 2312311. The reversal of 2312309 is 9032132.

2312309 = T₁₈₂ + T₁₈₃ + ... + T₂₇₀.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 819025 + 1493284 = 905^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312309 - 2⁴ = 2312293 is a prime.

It is a super-2 number, since 2×2312309² = 10693545822962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312369) 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, 12902 + ... + 13079.

It is an arithmetic number, because the mean of its divisors is an integer number (584595).

2^2312309 is an apocalyptic number.

It is an amenable number.

2312309 is a deficient number, since it is larger than the sum of its proper divisors (26071).

2312309 is an equidigital number, since it uses as much as digits as its factorization.

2312309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26070.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 2312309 is about 1520.6278308646. The cubic root of 2312309 is about 132.2356709663.

The spelling of 2312309 in words is "two million, three hundred twelve thousand, three hundred nine".