18312427293 has 16 divisors (see below), whose sum is σ = 25522371456. Its totient is φ = 11657226240.

The previous prime is 18312427241. The next prime is 18312427321. The reversal of 18312427293 is 39272421381.

It is not a de Polignac number, because 18312427293 - 2⁸ = 18312427037 is a prime.

It is a super-2 number, since 2×18312427293² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18312417293) 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, 190168 + ... + 269793.

It is an arithmetic number, because the mean of its divisors is an integer number (1595148216).

Almost surely, 2^18312427293 is an apocalyptic number.

It is an amenable number.

18312427293 is a deficient number, since it is larger than the sum of its proper divisors (7209944163).

18312427293 is a wasteful number, since it uses less digits than its factorization.

18312427293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460564.

The product of its digits is 145152, while the sum is 42.

The spelling of 18312427293 in words is "eighteen billion, three hundred twelve million, four hundred twenty-seven thousand, two hundred ninety-three".