723641 has 4 divisors (see below), whose sum is σ = 730512. Its totient is φ = 716772.

The previous prime is 723623. The next prime is 723661. The reversal of 723641 is 146327.

723641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 146327 = 131 ⋅1117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 723641.

It is not an unprimeable number, because it can be changed into a prime (723601) 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, 3275 + ... + 3488.

It is an arithmetic number, because the mean of its divisors is an integer number (182628).

2⁷²³⁶⁴¹ is an apocalyptic number.

It is an amenable number.

723641 is a deficient number, since it is larger than the sum of its proper divisors (6871).

723641 is a wasteful number, since it uses less digits than its factorization.

723641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6870.

The product of its digits is 1008, while the sum is 23.

The square root of 723641 is about 850.6709116926. The cubic root of 723641 is about 89.7789224063.

Adding to 723641 its reverse (146327), we get a palindrome (869968).

The spelling of 723641 in words is "seven hundred twenty-three thousand, six hundred forty-one".