18404319 has 8 divisors (see below), whose sum is σ = 25982640. Its totient is φ = 11547776.

The previous prime is 18404317. The next prime is 18404327. The reversal of 18404319 is 91340481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18404319 - 2¹ = 18404317 is a prime.

It is a super-2 number, since 2×18404319² = 677437915707522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180384 + ... + 180485.

It is an arithmetic number, because the mean of its divisors is an integer number (3247830).

Almost surely, 2^18404319 is an apocalyptic number.

18404319 is a deficient number, since it is larger than the sum of its proper divisors (7578321).

18404319 is a wasteful number, since it uses less digits than its factorization.

18404319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360889.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18404319 is about 4290.0255243996. The cubic root of 18404319 is about 264.0218789260.

The spelling of 18404319 in words is "eighteen million, four hundred four thousand, three hundred nineteen".