127998999 has 12 divisors (see below), whose sum is σ = 186966000. Its totient is φ = 84373344.

The previous prime is 127998971. The next prime is 127999033. The reversal of 127998999 is 999899721.

It is not a de Polignac number, because 127998999 - 2¹¹ = 127996951 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127998929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79099 + ... + 80700.

It is an arithmetic number, because the mean of its divisors is an integer number (15580500).

Almost surely, 2^127998999 is an apocalyptic number.

127998999 is a deficient number, since it is larger than the sum of its proper divisors (58967001).

127998999 is a wasteful number, since it uses less digits than its factorization.

127998999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159894 (or 159891 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 63.

The square root of 127998999 is about 11313.6642605303. The cubic root of 127998999 is about 503.9671062243.

The spelling of 127998999 in words is "one hundred twenty-seven million, nine hundred ninety-eight thousand, nine hundred ninety-nine".