18406383309 has 12 divisors (see below), whose sum is σ = 26726199552. Its totient is φ = 12206675400.

The previous prime is 18406383277. The next prime is 18406383389. The reversal of 18406383309 is 90338360481.

18406383309 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 638 + 3 + 3 + 0 + 9 = 666.

It is not a de Polignac number, because 18406383309 - 2⁵ = 18406383277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406383389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5352087 + ... + 5355524.

It is an arithmetic number, because the mean of its divisors is an integer number (2227183296).

Almost surely, 2^18406383309 is an apocalyptic number.

It is an amenable number.

18406383309 is a deficient number, since it is larger than the sum of its proper divisors (8319816243).

18406383309 is a wasteful number, since it uses less digits than its factorization.

18406383309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10707808 (or 10707805 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 18406383309 in words is "eighteen billion, four hundred six million, three hundred eighty-three thousand, three hundred nine".