18290636 has 48 divisors (see below), whose sum is σ = 39842880. Its totient is φ = 7153920.

The previous prime is 18290581. The next prime is 18290639. The reversal of 18290636 is 63609281.

It is a junction number, because it is equal to n+sod(n) for n = 18290596 and 18290605.

It is not an unprimeable number, because it can be changed into a prime (18290639) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39446 + ... + 39906.

It is an arithmetic number, because the mean of its divisors is an integer number (830060).

Almost surely, 2^18290636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18290636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19921440).

18290636 is an abundant number, since it is smaller than the sum of its proper divisors (21552244).

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

18290636 is a wasteful number, since it uses less digits than its factorization.

18290636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 18290636 is about 4276.7553121496. The cubic root of 18290636 is about 263.4771370019.

The spelling of 18290636 in words is "eighteen million, two hundred ninety thousand, six hundred thirty-six".