18390004409 has 16 divisors (see below), whose sum is σ = 21152912256. Its totient is φ = 15661296000.

The previous prime is 18390004387. The next prime is 18390004427. The reversal of 18390004409 is 90440009381.

It is not a de Polignac number, because 18390004409 - 2¹⁶ = 18389938873 is a prime.

It is a super-3 number, since 3×18390004409³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18390204409) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 877319 + ... + 898035.

It is an arithmetic number, because the mean of its divisors is an integer number (1322057016).

Almost surely, 2^18390004409 is an apocalyptic number.

It is an amenable number.

18390004409 is a deficient number, since it is larger than the sum of its proper divisors (2762907847).

18390004409 is a wasteful number, since it uses less digits than its factorization.

18390004409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21536.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 18390004409 in words is "eighteen billion, three hundred ninety million, four thousand, four hundred nine".