23085409 has 4 divisors (see below), whose sum is σ = 23096340. Its totient is φ = 23074480.

The previous prime is 23085397. The next prime is 23085427. The reversal of 23085409 is 90458032.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4293184 + 18792225 = 2072^2 + 4335^2 .

It is a cyclic number.

It is not a de Polignac number, because 23085409 - 2¹⁵ = 23052641 is a prime.

It is a super-2 number, since 2×23085409² = 1065872217394562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23085449) 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, 1174 + ... + 6895.

It is an arithmetic number, because the mean of its divisors is an integer number (5774085).

Almost surely, 2^23085409 is an apocalyptic number.

It is an amenable number.

23085409 is a deficient number, since it is larger than the sum of its proper divisors (10931).

23085409 is an equidigital number, since it uses as much as digits as its factorization.

23085409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10930.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 23085409 is about 4804.7277758475. The cubic root of 23085409 is about 284.7382803029.

The spelling of 23085409 in words is "twenty-three million, eighty-five thousand, four hundred nine".