18984380859 has 32 divisors (see below), whose sum is σ = 28859950080. Its totient is φ = 12328092000.

The previous prime is 18984380843. The next prime is 18984380861. The reversal of 18984380859 is 95808348981.

It is a happy number.

It is not a de Polignac number, because 18984380859 - 2⁴ = 18984380843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18984380796 and 18984380805.

It is not an unprimeable number, because it can be changed into a prime (18984380759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232309 + ... + 303209.

It is an arithmetic number, because the mean of its divisors is an integer number (901873440).

Almost surely, 2^18984380859 is an apocalyptic number.

18984380859 is a deficient number, since it is larger than the sum of its proper divisors (9875569221).

18984380859 is a wasteful number, since it uses less digits than its factorization.

18984380859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71168 (or 71162 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 18984380859 in words is "eighteen billion, nine hundred eighty-four million, three hundred eighty thousand, eight hundred fifty-nine".