18040512 has 112 divisors (see below), whose sum is σ = 56440832. Its totient is φ = 4976640.

The previous prime is 18040507. The next prime is 18040513. The reversal of 18040512 is 21504081.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (18040513) 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, 41448 + ... + 41880.

It is an arithmetic number, because the mean of its divisors is an integer number (503936).

Almost surely, 2^18040512 is an apocalyptic number.

18040512 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 18040512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28220416).

18040512 is an abundant number, since it is smaller than the sum of its proper divisors (38400320).

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

18040512 is a wasteful number, since it uses less digits than its factorization.

18040512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18040512 is about 4247.4123887374. The cubic root of 18040512 is about 262.2706059442.

Adding to 18040512 its reverse (21504081), we get a palindrome (39544593).

The spelling of 18040512 in words is "eighteen million, forty thousand, five hundred twelve".