18040422 has 8 divisors (see below), whose sum is σ = 36080856. Its totient is φ = 6013472.

The previous prime is 18040411. The next prime is 18040427. The reversal of 18040422 is 22404081.

It is a sphenic number, since it is the product of 3 distinct primes.

18040422 is an admirable number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040427) 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 3 ways as a sum of consecutive naturals, for example, 1503363 + ... + 1503374.

It is an arithmetic number, because the mean of its divisors is an integer number (4510107).

Almost surely, 2^18040422 is an apocalyptic number.

18040422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18040422 is a wasteful number, since it uses less digits than its factorization.

18040422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006742.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 18040422 is about 4247.4017940383. The cubic root of 18040422 is about 262.2701698074.

The spelling of 18040422 in words is "eighteen million, forty thousand, four hundred twenty-two".