127697979 has 4 divisors (see below), whose sum is σ = 170263976. Its totient is φ = 85131984.

The previous prime is 127697963. The next prime is 127697981. The reversal of 127697979 is 979796721.

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

It is not a de Polignac number, because 127697979 - 2⁴ = 127697963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127697579) 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, 21282994 + ... + 21282999.

It is an arithmetic number, because the mean of its divisors is an integer number (42565994).

Almost surely, 2^127697979 is an apocalyptic number.

127697979 is a deficient number, since it is larger than the sum of its proper divisors (42565997).

127697979 is an equidigital number, since it uses as much as digits as its factorization.

127697979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42565996.

The product of its digits is 3000564, while the sum is 57.

The square root of 127697979 is about 11300.3530475822. The cubic root of 127697979 is about 503.5717300680.

The spelling of 127697979 in words is "one hundred twenty-seven million, six hundred ninety-seven thousand, nine hundred seventy-nine".