723450 has 96 divisors (see below), whose sum is σ = 2249856. Its totient is φ = 149760.

The previous prime is 723439. The next prime is 723451. The reversal of 723450 is 54327.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723451) by changing a digit.

723450 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 47 ways as a sum of consecutive naturals, for example, 13624 + ... + 13676.

It is an arithmetic number, because the mean of its divisors is an integer number (23436).

2⁷²³⁴⁵⁰ is an apocalyptic number.

723450 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

723450 is the 455-th nonagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928).

723450 is an abundant number, since it is smaller than the sum of its proper divisors (1526406).

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

723450 is a wasteful number, since it uses less digits than its factorization.

723450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 723450 is about 850.5586399538. The cubic root of 723450 is about 89.7710228709.

Adding to 723450 its reverse (54327), we get a palindrome (777777).

The spelling of 723450 in words is "seven hundred twenty-three thousand, four hundred fifty".