723439 has 2 divisors, whose sum is σ = 723440. Its totient is φ = 723438.

The previous prime is 723421. The next prime is 723451. The reversal of 723439 is 934327.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 723439 - 2⁵ = 723407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (723409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361719 + 361720.

It is an arithmetic number, because the mean of its divisors is an integer number (361720).

2⁷²³⁴³⁹ is an apocalyptic number.

723439 is a deficient number, since it is larger than the sum of its proper divisors (1).

723439 is an equidigital number, since it uses as much as digits as its factorization.

723439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 28.

The square root of 723439 is about 850.5521735908. The cubic root of 723439 is about 89.7705678815.

The spelling of 723439 in words is "seven hundred twenty-three thousand, four hundred thirty-nine".