18440823 has 8 divisors (see below), whose sum is σ = 24724336. Its totient is φ = 12225600.

The previous prime is 18440813. The next prime is 18440831. The reversal of 18440823 is 32804481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18440823 - 2⁵ = 18440791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440813) 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 7 ways as a sum of consecutive naturals, for example, 16438 + ... + 17523.

It is an arithmetic number, because the mean of its divisors is an integer number (3090542).

Almost surely, 2^18440823 is an apocalyptic number.

18440823 is a deficient number, since it is larger than the sum of its proper divisors (6283513).

18440823 is a wasteful number, since it uses less digits than its factorization.

18440823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34145.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 18440823 is about 4294.2779369761. The cubic root of 18440823 is about 264.1963214870.

The spelling of 18440823 in words is "eighteen million, four hundred forty thousand, eight hundred twenty-three".