18280836 has 48 divisors (see below), whose sum is σ = 54167680. Its totient is φ = 5222880.

The previous prime is 18280771. The next prime is 18280861. The reversal of 18280836 is 63808281.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18280836.

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 15 ways as a sum of consecutive naturals, for example, 11335 + ... + 12846.

Almost surely, 2^18280836 is an apocalyptic number.

It is an amenable number.

18280836 is an abundant number, since it is smaller than the sum of its proper divisors (35886844).

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

18280836 is a wasteful number, since it uses less digits than its factorization.

18280836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24201 (or 24193 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18280836 is about 4275.6094302450. The cubic root of 18280836 is about 263.4300721681.

It can be divided in two parts, 182 and 80836, that added together give a palindrome (81018).

The spelling of 18280836 in words is "eighteen million, two hundred eighty thousand, eight hundred thirty-six".