18312543 has 12 divisors (see below), whose sum is σ = 27363960. Its totient is φ = 11787216.

The previous prime is 18312517. The next prime is 18312557. The reversal of 18312543 is 34521381.

It is a happy number.

It is not a de Polignac number, because 18312543 - 2²² = 14118239 is a prime.

It is a super-2 number, since 2×18312543² = 670698462253698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18312643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34821 + ... + 35342.

It is an arithmetic number, because the mean of its divisors is an integer number (2280330).

Almost surely, 2^18312543 is an apocalyptic number.

18312543 is a deficient number, since it is larger than the sum of its proper divisors (9051417).

18312543 is a wasteful number, since it uses less digits than its factorization.

18312543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70198 (or 70195 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 18312543 is about 4279.3157163266. The cubic root of 18312543 is about 263.5822853552.

The spelling of 18312543 in words is "eighteen million, three hundred twelve thousand, five hundred forty-three".