723871 has 4 divisors (see below), whose sum is σ = 736200. Its totient is φ = 711544.

The previous prime is 723859. The next prime is 723893. The reversal of 723871 is 178327.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 723871 - 2⁵ = 723839 is a prime.

It is an Ulam number.

It is a Duffinian number.

723871 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6076 + ... + 6193.

It is an arithmetic number, because the mean of its divisors is an integer number (184050).

2⁷²³⁸⁷¹ is an apocalyptic number.

723871 is a deficient number, since it is larger than the sum of its proper divisors (12329).

723871 is a wasteful number, since it uses less digits than its factorization.

723871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12328.

The product of its digits is 2352, while the sum is 28.

The square root of 723871 is about 850.8060883656. The cubic root of 723871 is about 89.7884330913.

The spelling of 723871 in words is "seven hundred twenty-three thousand, eight hundred seventy-one".