723816 has 40 divisors (see below), whose sum is σ = 2029170. Its totient is φ = 241056.

The previous prime is 723803. The next prime is 723823. The reversal of 723816 is 618327.

It can be written as a sum of positive squares in only one way, i.e., 715716 + 8100 = 846^2 + 90^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a self number, because there is not a number n which added to its sum of digits gives 723816.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 90 + ... + 1206.

2⁷²³⁸¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014585).

723816 is an abundant number, since it is smaller than the sum of its proper divisors (1305354).

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

723816 is a wasteful number, since it uses less digits than its factorization.

723816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1122 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 723816 is about 850.7737654629. The cubic root of 723816 is about 89.7861589804.

The spelling of 723816 in words is "seven hundred twenty-three thousand, eight hundred sixteen".