18243927469 has 4 divisors (see below), whose sum is σ = 18668204896. Its totient is φ = 17819650044.

The previous prime is 18243927437. The next prime is 18243927479. The reversal of 18243927469 is 96472934281.

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.

It is a cyclic number.

It is not a de Polignac number, because 18243927469 - 2⁵ = 18243927437 is a prime.

It is a super-2 number, since 2×18243927469² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243927409) 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, 212138649 + ... + 212138734.

It is an arithmetic number, because the mean of its divisors is an integer number (4667051224).

Almost surely, 2^18243927469 is an apocalyptic number.

It is an amenable number.

18243927469 is a deficient number, since it is larger than the sum of its proper divisors (424277427).

18243927469 is an equidigital number, since it uses as much as digits as its factorization.

18243927469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424277426.

The product of its digits is 5225472, while the sum is 55.

It can be divided in two parts, 1824 and 3927469, that added together give a palindrome (3929293).

The spelling of 18243927469 in words is "eighteen billion, two hundred forty-three million, nine hundred twenty-seven thousand, four hundred sixty-nine".