126979 has 4 divisors (see below), whose sum is σ = 129976. Its totient is φ = 123984.

The previous prime is 126967. The next prime is 126989. The reversal of 126979 is 979621.

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 126979 - 2⁷ = 126851 is a prime.

It is a super-2 number, since 2×126979² = 32247332882, which contains 22 as substring.

It is a Duffinian number.

126979 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (126949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434 + ... + 1519.

It is an arithmetic number, because the mean of its divisors is an integer number (32494).

2¹²⁶⁹⁷⁹ is an apocalyptic number.

126979 is a deficient number, since it is larger than the sum of its proper divisors (2997).

126979 is an equidigital number, since it uses as much as digits as its factorization.

126979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996.

The product of its digits is 6804, while the sum is 34.

The square root of 126979 is about 356.3411286955. The cubic root of 126979 is about 50.2624862744.

The spelling of 126979 in words is "one hundred twenty-six thousand, nine hundred seventy-nine".