18823481 has 4 divisors (see below), whose sum is σ = 18832464. Its totient is φ = 18814500.

The previous prime is 18823477. The next prime is 18823489. The reversal of 18823481 is 18432881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18823481 - 2² = 18823477 is a prime.

It is a super-2 number, since 2×18823481² = 708646873914722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18823489) 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, 506 + ... + 6156.

It is an arithmetic number, because the mean of its divisors is an integer number (4708116).

Almost surely, 2^18823481 is an apocalyptic number.

It is an amenable number.

18823481 is a deficient number, since it is larger than the sum of its proper divisors (8983).

18823481 is an equidigital number, since it uses as much as digits as its factorization.

18823481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8982.

The product of its digits is 12288, while the sum is 35.

The square root of 18823481 is about 4338.6035771893. The cubic root of 18823481 is about 266.0112353217.

The spelling of 18823481 in words is "eighteen million, eight hundred twenty-three thousand, four hundred eighty-one".