18782023 has 4 divisors (see below), whose sum is σ = 20226808. Its totient is φ = 17337240.

The previous prime is 18782009. The next prime is 18782047. The reversal of 18782023 is 32028781.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18782023 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 (18782123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722373 + ... + 722398.

It is an arithmetic number, because the mean of its divisors is an integer number (5056702).

Almost surely, 2^18782023 is an apocalyptic number.

18782023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18782023 is a deficient number, since it is larger than the sum of its proper divisors (1444785).

18782023 is a wasteful number, since it uses less digits than its factorization.

18782023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444784.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18782023 is about 4333.8231389848. The cubic root of 18782023 is about 265.8157985658.

The spelling of 18782023 in words is "eighteen million, seven hundred eighty-two thousand, twenty-three".