127989818 has 32 divisors (see below), whose sum is σ = 219360960. Its totient is φ = 55471360.

The previous prime is 127989811. The next prime is 127989839. The reversal of 127989818 is 818989721.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 127989818.

It is not an unprimeable number, because it can be changed into a prime (127989811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51746 + ... + 54162.

It is an arithmetic number, because the mean of its divisors is an integer number (6855030).

Almost surely, 2^127989818 is an apocalyptic number.

127989818 is a deficient number, since it is larger than the sum of its proper divisors (91371142).

127989818 is a wasteful number, since it uses less digits than its factorization.

127989818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542.

The product of its digits is 580608, while the sum is 53.

The square root of 127989818 is about 11313.2585049578. The cubic root of 127989818 is about 503.9550565660.

The spelling of 127989818 in words is "one hundred twenty-seven million, nine hundred eighty-nine thousand, eight hundred eighteen".