23178643 has 4 divisors (see below), whose sum is σ = 23361280. Its totient is φ = 22996008.

The previous prime is 23178587. The next prime is 23178647. The reversal of 23178643 is 34687132.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 23178643 - 2⁹ = 23178131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23178599 and 23178608.

It is not an unprimeable number, because it can be changed into a prime (23178647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91128 + ... + 91381.

It is an arithmetic number, because the mean of its divisors is an integer number (5840320).

Almost surely, 2^23178643 is an apocalyptic number.

23178643 is a deficient number, since it is larger than the sum of its proper divisors (182637).

23178643 is a wasteful number, since it uses less digits than its factorization.

23178643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182636.

The product of its digits is 24192, while the sum is 34.

The square root of 23178643 is about 4814.4203181692. The cubic root of 23178643 is about 285.1210853084.

The spelling of 23178643 in words is "twenty-three million, one hundred seventy-eight thousand, six hundred forty-three".