18823845 has 16 divisors (see below), whose sum is σ = 31890240. Its totient is φ = 9448704.

The previous prime is 18823843. The next prime is 18823873. The reversal of 18823845 is 54832881.

It is not a de Polignac number, because 18823845 - 2¹ = 18823843 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18823841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36655 + ... + 37164.

It is an arithmetic number, because the mean of its divisors is an integer number (1993140).

Almost surely, 2^18823845 is an apocalyptic number.

18823845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18823845 is a deficient number, since it is larger than the sum of its proper divisors (13066395).

18823845 is a wasteful number, since it uses less digits than its factorization.

18823845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73844.

The product of its digits is 61440, while the sum is 39.

The square root of 18823845 is about 4338.6455259678. The cubic root of 18823845 is about 266.0129499791.

The spelling of 18823845 in words is "eighteen million, eight hundred twenty-three thousand, eight hundred forty-five".