723913 has 2 divisors, whose sum is σ = 723914. Its totient is φ = 723912.

The previous prime is 723907. The next prime is 723917. The reversal of 723913 is 319327.

723913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537289 + 186624 = 733^2 + 432^2 .

It is an emirp because it is prime and its reverse (319327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-723913 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (723917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361956 + 361957.

It is an arithmetic number, because the mean of its divisors is an integer number (361957).

2⁷²³⁹¹³ is an apocalyptic number.

It is an amenable number.

723913 is a deficient number, since it is larger than the sum of its proper divisors (1).

723913 is an equidigital number, since it uses as much as digits as its factorization.

723913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 25.

The square root of 723913 is about 850.8307704826. The cubic root of 723913 is about 89.7901696076.

The spelling of 723913 in words is "seven hundred twenty-three thousand, nine hundred thirteen".