720423 has 24 divisors (see below), whose sum is σ = 1198080. Its totient is φ = 412560.

The previous prime is 720413. The next prime is 720439. The reversal of 720423 is 324027.

It is a happy number.

It is not a de Polignac number, because 720423 - 2⁴ = 720407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 720396 and 720405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1690 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (49920).

2⁷²⁰⁴²³ is an apocalyptic number.

720423 is a deficient number, since it is larger than the sum of its proper divisors (477657).

720423 is a wasteful number, since it uses less digits than its factorization.

720423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 720423 is about 848.7773559656. Note that the first 3 decimals coincide. The cubic root of 720423 is about 89.6456436636.

It can be divided in two parts, 7204 and 23, that added together give a palindrome (7227).

The spelling of 720423 in words is "seven hundred twenty thousand, four hundred twenty-three", and thus it is an iban number.