18259396812 has 120 divisors (see below), whose sum is σ = 48136094160. Its totient is φ = 6035420160.

The previous prime is 18259396783. The next prime is 18259396819. The reversal of 18259396812 is 21869395281.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18259396819) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 29593528 + ... + 29594144.

It is an arithmetic number, because the mean of its divisors is an integer number (401134118).

Almost surely, 2^18259396812 is an apocalyptic number.

18259396812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18259396812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24068047080).

18259396812 is an abundant number, since it is smaller than the sum of its proper divisors (29876697348).

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

18259396812 is a wasteful number, since it uses less digits than its factorization.

18259396812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1242 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 18259396812 in words is "eighteen billion, two hundred fifty-nine million, three hundred ninety-six thousand, eight hundred twelve".