126205723 has 6 divisors (see below), whose sum is σ = 146810796. Its totient is φ = 108176292.

The previous prime is 126205721. The next prime is 126205753. The reversal of 126205723 is 327502621.

It is not a de Polignac number, because 126205723 - 2¹ = 126205721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126205691 and 126205700.

It is not an unprimeable number, because it can be changed into a prime (126205721) 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 5 ways as a sum of consecutive naturals, for example, 1287765 + ... + 1287862.

It is an arithmetic number, because the mean of its divisors is an integer number (24468466).

Almost surely, 2^126205723 is an apocalyptic number.

126205723 is a deficient number, since it is larger than the sum of its proper divisors (20605073).

126205723 is an equidigital number, since it uses as much as digits as its factorization.

126205723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575641 (or 2575634 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 126205723 is about 11234.1320537013. The cubic root of 126205723 is about 501.6024892363.

The spelling of 126205723 in words is "one hundred twenty-six million, two hundred five thousand, seven hundred twenty-three".