18408046388 has 24 divisors (see below), whose sum is σ = 33271816704. Its totient is φ = 8902144800.

The previous prime is 18408046361. The next prime is 18408046439. The reversal of 18408046388 is 88364080481.

It is a super-4 number, since 4×18408046388⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 186506 + ... + 267582.

It is an arithmetic number, because the mean of its divisors is an integer number (1386325696).

Almost surely, 2^18408046388 is an apocalyptic number.

It is an amenable number.

18408046388 is a deficient number, since it is larger than the sum of its proper divisors (14863770316).

18408046388 is a wasteful number, since it uses less digits than its factorization.

18408046388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82943 (or 82941 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 18408046388 in words is "eighteen billion, four hundred eight million, forty-six thousand, three hundred eighty-eight".