724426 has 4 divisors (see below), whose sum is σ = 1086642. Its totient is φ = 362212.

The previous prime is 724403. The next prime is 724433. The reversal of 724426 is 624427.

724426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 724201 + 225 = 851^2 + 15^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 724426.

It is an unprimeable number.

724426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181105 + ... + 181108.

2⁷²⁴⁴²⁶ is an apocalyptic number.

724426 is a deficient number, since it is larger than the sum of its proper divisors (362216).

724426 is a wasteful number, since it uses less digits than its factorization.

724426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362215.

The product of its digits is 2688, while the sum is 25.

The square root of 724426 is about 851.1321871484. The cubic root of 724426 is about 89.8113744948.

Subtracting from 724426 its reverse (624427), we obtain a palindrome (99999).

The spelling of 724426 in words is "seven hundred twenty-four thousand, four hundred twenty-six".