18407936 has 40 divisors (see below), whose sum is σ = 37175820. Its totient is φ = 9105408.

The previous prime is 18407933. The next prime is 18407947. The reversal of 18407936 is 63970481.

It can be written as a sum of positive squares in 2 ways, for example, as 17977600 + 430336 = 4240^2 + 656^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18407936.

It is not an unprimeable number, because it can be changed into a prime (18407933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80270 + ... + 80498.

Almost surely, 2^18407936 is an apocalyptic number.

18407936 is a gapful number since it is divisible by the number (16) 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 18407936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18587910).

18407936 is an abundant number, since it is smaller than the sum of its proper divisors (18767884).

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

18407936 is an equidigital number, since it uses as much as digits as its factorization.

18407936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 18407936 is about 4290.4470629528. The cubic root of 18407936 is about 264.0391738624.

The spelling of 18407936 in words is "eighteen million, four hundred seven thousand, nine hundred thirty-six".