723684861 has 20 divisors (see below), whose sum is σ = 1085538432. Its totient is φ = 482443452.

The previous prime is 723684859. The next prime is 723684931. The reversal of 723684861 is 168486327.

It is not a de Polignac number, because 723684861 - 2¹ = 723684859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723684851) 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 19 ways as a sum of consecutive naturals, for example, 1300 + ... + 38066.

Almost surely, 2^723684861 is an apocalyptic number.

It is an amenable number.

723684861 is a deficient number, since it is larger than the sum of its proper divisors (361853571).

723684861 is an frugal number, since it uses more digits than its factorization.

723684861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36794 (or 36770 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 723684861 is about 26901.3914324148. The cubic root of 723684861 is about 897.8073624945.

It can be divided in two parts, 723 and 684861, that added together give a square (685584 = 828²).

The spelling of 723684861 in words is "seven hundred twenty-three million, six hundred eighty-four thousand, eight hundred sixty-one".