18404568 has 144 divisors (see below), whose sum is σ = 62527920. Its totient is φ = 4762368.

The previous prime is 18404567. The next prime is 18404579. The reversal of 18404568 is 86540481.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404567) 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 35 ways as a sum of consecutive naturals, for example, 347230 + ... + 347282.

Almost surely, 2^18404568 is an apocalyptic number.

18404568 is a gapful number since it is divisible by the number (18) 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 18404568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31263960).

18404568 is an abundant number, since it is smaller than the sum of its proper divisors (44123352).

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

18404568 is a wasteful number, since it uses less digits than its factorization.

18404568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 18404568 is about 4290.0545451078. The cubic root of 18404568 is about 264.0230696094.

The spelling of 18404568 in words is "eighteen million, four hundred four thousand, five hundred sixty-eight".