18404037 has 8 divisors (see below), whose sum is σ = 27265280. Its totient is φ = 12269340.

The previous prime is 18404021. The next prime is 18404041. The reversal of 18404037 is 73040481.

It is not a de Polignac number, because 18404037 - 2⁴ = 18404021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 681631 = 18404037 / (1 + 8 + 4 + 0 + 4 + 0 + 3 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18404037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404137) 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 7 ways as a sum of consecutive naturals, for example, 340789 + ... + 340842.

It is an arithmetic number, because the mean of its divisors is an integer number (3408160).

Almost surely, 2^18404037 is an apocalyptic number.

It is an amenable number.

18404037 is a deficient number, since it is larger than the sum of its proper divisors (8861243).

18404037 is an equidigital number, since it uses as much as digits as its factorization.

18404037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681640 (or 681634 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18404037 is about 4289.9926573364. The cubic root of 18404037 is about 264.0205304282.

The spelling of 18404037 in words is "eighteen million, four hundred four thousand, thirty-seven".