723841 has 4 divisors (see below), whose sum is σ = 726784. Its totient is φ = 720900.

The previous prime is 723839. The next prime is 723851. The reversal of 723841 is 148327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 148327 = 23 ⋅6449.

It is a cyclic number.

It is not a de Polignac number, because 723841 - 2¹ = 723839 is a prime.

It is a Duffinian number.

723841 is a lucky 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, 1065 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (181696).

2⁷²³⁸⁴¹ is an apocalyptic number.

It is an amenable number.

723841 is a deficient number, since it is larger than the sum of its proper divisors (2943).

723841 is a wasteful number, since it uses less digits than its factorization.

723841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2942.

The product of its digits is 1344, while the sum is 25.

The square root of 723841 is about 850.7884578437. The cubic root of 723841 is about 89.7871926815.

The spelling of 723841 in words is "seven hundred twenty-three thousand, eight hundred forty-one".