126745 has 4 divisors (see below), whose sum is σ = 152100. Its totient is φ = 101392.

The previous prime is 126743. The next prime is 126751. The reversal of 126745 is 547621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547621 = 17 ⋅32213.

It can be written as a sum of positive squares in 2 ways, for example, as 46656 + 80089 = 216^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 126745 - 2¹ = 126743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126743) 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, 12670 + ... + 12679.

It is an arithmetic number, because the mean of its divisors is an integer number (38025).

2¹²⁶⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

126745 is a deficient number, since it is larger than the sum of its proper divisors (25355).

126745 is an equidigital number, since it uses as much as digits as its factorization.

126745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25354.

The product of its digits is 1680, while the sum is 25.

The square root of 126745 is about 356.0126402250. The cubic root of 126745 is about 50.2315923105.

The spelling of 126745 in words is "one hundred twenty-six thousand, seven hundred forty-five".