11923565 has 4 divisors (see below), whose sum is σ = 14308284. Its totient is φ = 9538848.

The previous prime is 11923543. The next prime is 11923603. The reversal of 11923565 is 56532911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56532911 = 1601 ⋅35311.

It can be written as a sum of positive squares in 2 ways, for example, as 6568969 + 5354596 = 2563^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 11923565 - 2⁶ = 11923501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192352 + ... + 1192361.

It is an arithmetic number, because the mean of its divisors is an integer number (3577071).

Almost surely, 2^11923565 is an apocalyptic number.

It is an amenable number.

11923565 is a deficient number, since it is larger than the sum of its proper divisors (2384719).

11923565 is an equidigital number, since it uses as much as digits as its factorization.

11923565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384718.

The product of its digits is 8100, while the sum is 32.

The square root of 11923565 is about 3453.0515489926. The cubic root of 11923565 is about 228.4557225949.

The spelling of 11923565 in words is "eleven million, nine hundred twenty-three thousand, five hundred sixty-five".