23405845 has 4 divisors (see below), whose sum is σ = 28087020. Its totient is φ = 18724672.

The previous prime is 23405839. The next prime is 23405849. The reversal of 23405845 is 54850432.

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 10510564 + 12895281 = 3242^2 + 3591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23405845 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23405849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2340580 + ... + 2340589.

It is an arithmetic number, because the mean of its divisors is an integer number (7021755).

Almost surely, 2^23405845 is an apocalyptic number.

It is an amenable number.

23405845 is a deficient number, since it is larger than the sum of its proper divisors (4681175).

23405845 is an equidigital number, since it uses as much as digits as its factorization.

23405845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4681174.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 23405845 is about 4837.9587637763. The cubic root of 23405845 is about 286.0496637310.

The spelling of 23405845 in words is "twenty-three million, four hundred five thousand, eight hundred forty-five".