127491979 has 4 divisors (see below), whose sum is σ = 129652920. Its totient is φ = 125331040.

The previous prime is 127491971. The next prime is 127491983. The reversal of 127491979 is 979194721.

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

It is a cyclic number.

It is not a de Polignac number, because 127491979 - 2³ = 127491971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127491971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080382 + ... + 1080499.

It is an arithmetic number, because the mean of its divisors is an integer number (32413230).

Almost surely, 2^127491979 is an apocalyptic number.

127491979 is a deficient number, since it is larger than the sum of its proper divisors (2160941).

127491979 is an equidigital number, since it uses as much as digits as its factorization.

127491979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160940.

The product of its digits is 285768, while the sum is 49.

The square root of 127491979 is about 11291.2346092002. The cubic root of 127491979 is about 503.3008001525.

The spelling of 127491979 in words is "one hundred twenty-seven million, four hundred ninety-one thousand, nine hundred seventy-nine".