18404180 has 12 divisors (see below), whose sum is σ = 38648820. Its totient is φ = 7361664.

The previous prime is 18404161. The next prime is 18404189. The reversal of 18404180 is 8140481.

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 9947716 = 2908^2 + 3154^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404189) 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, 460085 + ... + 460124.

It is an arithmetic number, because the mean of its divisors is an integer number (3220735).

Almost surely, 2^18404180 is an apocalyptic number.

18404180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18404180 is an abundant number, since it is smaller than the sum of its proper divisors (20244640).

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

18404180 is a wasteful number, since it uses less digits than its factorization.

18404180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920218 (or 920216 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 18404180 is about 4290.0093239992. The cubic root of 18404180 is about 264.0212142426.

The spelling of 18404180 in words is "eighteen million, four hundred four thousand, one hundred eighty".