723281 has 16 divisors (see below), whose sum is σ = 846720. Its totient is φ = 612480.

The previous prime is 723271. The next prime is 723287. The reversal of 723281 is 182327.

It is a cyclic number.

It is not a de Polignac number, because 723281 - 2¹⁰ = 722257 is a prime.

It is a super-2 number, since 2×723281² = 1046270809922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 723281.

It is not an unprimeable number, because it can be changed into a prime (723287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12230 + ... + 12288.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁷²³²⁸¹ is an apocalyptic number.

It is an amenable number.

723281 is a deficient number, since it is larger than the sum of its proper divisors (123439).

723281 is a wasteful number, since it uses less digits than its factorization.

723281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its digits is 672, while the sum is 23.

The square root of 723281 is about 850.4592876793. The cubic root of 723281 is about 89.7640320702.

The spelling of 723281 in words is "seven hundred twenty-three thousand, two hundred eighty-one".