18312745 has 12 divisors (see below), whose sum is σ = 24155460. Its totient is φ = 13317920.

The previous prime is 18312737. The next prime is 18312769. The reversal of 18312745 is 54721381.

It can be written as a sum of positive squares in 2 ways, for example, as 11108889 + 7203856 = 3333^2 + 2684^2 .

It is not a de Polignac number, because 18312745 - 2³ = 18312737 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14530 + ... + 15739.

It is an arithmetic number, because the mean of its divisors is an integer number (2012955).

Almost surely, 2^18312745 is an apocalyptic number.

It is an amenable number.

18312745 is a deficient number, since it is larger than the sum of its proper divisors (5842715).

18312745 is a wasteful number, since it uses less digits than its factorization.

18312745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30296 (or 30285 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 18312745 is about 4279.3393181658. The cubic root of 18312745 is about 263.5832545165.

The spelling of 18312745 in words is "eighteen million, three hundred twelve thousand, seven hundred forty-five".