18091404 has 48 divisors (see below), whose sum is σ = 47308800. Its totient is φ = 5978448.

The previous prime is 18091393. The next prime is 18091421. The reversal of 18091404 is 40419081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13057 + ... + 14375.

It is an arithmetic number, because the mean of its divisors is an integer number (985600).

Almost surely, 2^18091404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18091404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23654400).

18091404 is an abundant number, since it is smaller than the sum of its proper divisors (29217396).

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

18091404 is a wasteful number, since it uses less digits than its factorization.

18091404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18091404 is about 4253.3991112991. The cubic root of 18091404 is about 262.5169948181.

The spelling of 18091404 in words is "eighteen million, ninety-one thousand, four hundred four".