723917 has 2 divisors, whose sum is σ = 723918. Its totient is φ = 723916.

The previous prime is 723913. The next prime is 723923. The reversal of 723917 is 719327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376996 + 346921 = 614^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 723917 - 2² = 723913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 723917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (723913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361958 + 361959.

It is an arithmetic number, because the mean of its divisors is an integer number (361959).

2⁷²³⁹¹⁷ is an apocalyptic number.

It is an amenable number.

723917 is a deficient number, since it is larger than the sum of its proper divisors (1).

723917 is an equidigital number, since it uses as much as digits as its factorization.

723917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646, while the sum is 29.

The square root of 723917 is about 850.8331211231. The cubic root of 723917 is about 89.7903349866.

The spelling of 723917 in words is "seven hundred twenty-three thousand, nine hundred seventeen".