18199404 has 30 divisors (see below), whose sum is σ = 47577684. Its totient is φ = 6066360.

The previous prime is 18199381. The next prime is 18199421. The reversal of 18199404 is 40499181.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 27762 + ... + 28409.

Almost surely, 2^18199404 is an apocalyptic number.

It is an amenable number.

18199404 is an abundant number, since it is smaller than the sum of its proper divisors (29378280).

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

18199404 is a wasteful number, since it uses less digits than its factorization.

18199404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56187 (or 56176 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18199404 is about 4266.0759486910. The cubic root of 18199404 is about 263.0383401049.

The spelling of 18199404 in words is "eighteen million, one hundred ninety-nine thousand, four hundred four".