18404336 has 40 divisors (see below), whose sum is σ = 38327904. Its totient is φ = 8529920.

The previous prime is 18404329. The next prime is 18404341. The reversal of 18404336 is 63340481.

It is a junction number, because it is equal to n+sod(n) for n = 18404299 and 18404308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18836 + ... + 19788.

Almost surely, 2^18404336 is an apocalyptic number.

18404336 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 18404336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19163952).

18404336 is an abundant number, since it is smaller than the sum of its proper divisors (19923568).

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

18404336 is a wasteful number, since it uses less digits than its factorization.

18404336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 18404336 is about 4290.0275057393. The cubic root of 18404336 is about 264.0219602179.

The spelling of 18404336 in words is "eighteen million, four hundred four thousand, three hundred thirty-six".