126659 has 4 divisors (see below), whose sum is σ = 136416. Its totient is φ = 116904.

The previous prime is 126653. The next prime is 126683. The reversal of 126659 is 956621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 956621 = 43 ⋅22247.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126659 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (126653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4859 + ... + 4884.

It is an arithmetic number, because the mean of its divisors is an integer number (34104).

2¹²⁶⁶⁵⁹ is an apocalyptic number.

126659 is a deficient number, since it is larger than the sum of its proper divisors (9757).

126659 is an equidigital number, since it uses as much as digits as its factorization.

126659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9756.

The product of its digits is 3240, while the sum is 29.

The square root of 126659 is about 355.8918375012. The cubic root of 126659 is about 50.2202285634.

The spelling of 126659 in words is "one hundred twenty-six thousand, six hundred fifty-nine".