126639679 has 4 divisors (see below), whose sum is σ = 132145776. Its totient is φ = 121133584.

The previous prime is 126639673. The next prime is 126639683. The reversal of 126639679 is 976936621.

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 126639679 - 2³ = 126639671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126639671) 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, 2753014 + ... + 2753059.

It is an arithmetic number, because the mean of its divisors is an integer number (33036444).

Almost surely, 2^126639679 is an apocalyptic number.

126639679 is a deficient number, since it is larger than the sum of its proper divisors (5506097).

126639679 is an equidigital number, since it uses as much as digits as its factorization.

126639679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506096.

The product of its digits is 734832, while the sum is 49.

The square root of 126639679 is about 11253.4296549985. The cubic root of 126639679 is about 502.1767484471.

The spelling of 126639679 in words is "one hundred twenty-six million, six hundred thirty-nine thousand, six hundred seventy-nine".