728423 has 2 divisors, whose sum is σ = 728424. Its totient is φ = 728422.

The previous prime is 728417. The next prime is 728437. The reversal of 728423 is 324827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728423 - 2¹⁰ = 727399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728392 and 728401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364211 + 364212.

It is an arithmetic number, because the mean of its divisors is an integer number (364212).

2⁷²⁸⁴²³ is an apocalyptic number.

728423 is a deficient number, since it is larger than the sum of its proper divisors (1).

728423 is an equidigital number, since it uses as much as digits as its factorization.

728423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 728423 is about 853.4770061343. The cubic root of 728423 is about 89.9762488766.

The spelling of 728423 in words is "seven hundred twenty-eight thousand, four hundred twenty-three".