126779 has 4 divisors (see below), whose sum is σ = 128184. Its totient is φ = 125376.

The previous prime is 126761. The next prime is 126781. The reversal of 126779 is 977621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977621 = 109 ⋅8969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126779 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (126719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557 + ... + 750.

It is an arithmetic number, because the mean of its divisors is an integer number (32046).

2¹²⁶⁷⁷⁹ is an apocalyptic number.

126779 is a deficient number, since it is larger than the sum of its proper divisors (1405).

126779 is an equidigital number, since it uses as much as digits as its factorization.

126779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404.

The product of its digits is 5292, while the sum is 32.

The square root of 126779 is about 356.0603881366. The cubic root of 126779 is about 50.2360835368.

The spelling of 126779 in words is "one hundred twenty-six thousand, seven hundred seventy-nine".