127997686 has 4 divisors (see below), whose sum is σ = 191996532. Its totient is φ = 63998842.

The previous prime is 127997669. The next prime is 127997687. The reversal of 127997686 is 686799721.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127997687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999420 + ... + 31999423.

It is an arithmetic number, because the mean of its divisors is an integer number (47999133).

Almost surely, 2^127997686 is an apocalyptic number.

127997686 is a deficient number, since it is larger than the sum of its proper divisors (63998846).

127997686 is an equidigital number, since it uses as much as digits as its factorization.

127997686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63998845.

The product of its digits is 2286144, while the sum is 55.

The square root of 127997686 is about 11313.6062332043. The cubic root of 127997686 is about 503.9653830050.

The spelling of 127997686 in words is "one hundred twenty-seven million, nine hundred ninety-seven thousand, six hundred eighty-six".