8198999972 has 24 divisors (see below), whose sum is σ = 15210478080. Its totient is φ = 3853727360.

The previous prime is 8198999903. The next prime is 8198999993. The reversal of 8198999972 is 2799998918.

It is a junction number, because it is equal to n+sod(n) for n = 8198999896 and 8198999905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14804 + ... + 128907.

It is an arithmetic number, because the mean of its divisors is an integer number (633769920).

Almost surely, 2^8198999972 is an apocalyptic number.

It is an amenable number.

8198999972 is a deficient number, since it is larger than the sum of its proper divisors (7011478108).

8198999972 is a wasteful number, since it uses less digits than its factorization.

8198999972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144571 (or 144569 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 71.

The square root of 8198999972 is about 90548.3294821059. The cubic root of 8198999972 is about 2016.4476968392.

The spelling of 8198999972 in words is "eight billion, one hundred ninety-eight million, nine hundred ninety-nine thousand, nine hundred seventy-two".