18540012738 has 16 divisors (see below), whose sum is σ = 39932335296. Its totient is φ = 5704619280.

The previous prime is 18540012727. The next prime is 18540012763. The reversal of 18540012738 is 83721004581.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 18540012696 and 18540012705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118846158 + ... + 118846313.

It is an arithmetic number, because the mean of its divisors is an integer number (2495770956).

Almost surely, 2^18540012738 is an apocalyptic number.

18540012738 is an abundant number, since it is smaller than the sum of its proper divisors (21392322558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18540012738 is a wasteful number, since it uses less digits than its factorization.

18540012738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237692489.

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 18540012738 in words is "eighteen billion, five hundred forty million, twelve thousand, seven hundred thirty-eight".