723126 has 16 divisors (see below), whose sum is σ = 1456128. Its totient is φ = 239400.

The previous prime is 723119. The next prime is 723127. The reversal of 723126 is 621327.

It is a happy number.

It is a super-2 number, since 2×723126² = 1045822423752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723127) by changing a digit.

723126 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (91008).

2⁷²³¹²⁶ is an apocalyptic number.

723126 is an abundant number, since it is smaller than the sum of its proper divisors (733002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723126 is a wasteful number, since it uses less digits than its factorization.

723126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827.

The product of its digits is 504, while the sum is 21.

The square root of 723126 is about 850.3681555656. The cubic root of 723126 is about 89.7576194316.

The spelling of 723126 in words is "seven hundred twenty-three thousand, one hundred twenty-six".