18380823 has 16 divisors (see below), whose sum is σ = 25762176. Its totient is φ = 11642400.

The previous prime is 18380819. The next prime is 18380827. The reversal of 18380823 is 32808381.

It is an interprime number because it is at equal distance from previous prime (18380819) and next prime (18380827).

It is not a de Polignac number, because 18380823 - 2² = 18380819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18380827) 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 15 ways as a sum of consecutive naturals, for example, 2848 + ... + 6698.

It is an arithmetic number, because the mean of its divisors is an integer number (1610136).

Almost surely, 2^18380823 is an apocalyptic number.

18380823 is a deficient number, since it is larger than the sum of its proper divisors (7381353).

18380823 is a wasteful number, since it uses less digits than its factorization.

18380823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 18380823 is about 4287.2862045821. The cubic root of 18380823 is about 263.9094759652.

The spelling of 18380823 in words is "eighteen million, three hundred eighty thousand, eight hundred twenty-three".