18986404128 has 24 divisors (see below), whose sum is σ = 49839311088. Its totient is φ = 6328801344.

The previous prime is 18986404127. The next prime is 18986404133. The reversal of 18986404128 is 82140468981.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (18986404121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98887426 + ... + 98887617.

It is an arithmetic number, because the mean of its divisors is an integer number (2076637962).

Almost surely, 2^18986404128 is an apocalyptic number.

It is an amenable number.

18986404128 is an abundant number, since it is smaller than the sum of its proper divisors (30852906960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18986404128 is a wasteful number, since it uses less digits than its factorization.

18986404128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197775056 (or 197775048 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 51.

The spelling of 18986404128 in words is "eighteen billion, nine hundred eighty-six million, four hundred four thousand, one hundred twenty-eight".