726388 has 24 divisors (see below), whose sum is σ = 1397480. Its totient is φ = 328320.

The previous prime is 726379. The next prime is 726391. The reversal of 726388 is 883627.

It is a happy number.

726388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17424 + 708964 = 132^2 + 842^2 .

It is a congruent number.

It is an unprimeable number.

726388 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 in 7 ways as a sum of consecutive naturals, for example, 3058 + ... + 3286.

2⁷²⁶³⁸⁸ is an apocalyptic number.

It is an amenable number.

726388 is a deficient number, since it is larger than the sum of its proper divisors (671092).

726388 is a wasteful number, since it uses less digits than its factorization.

726388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 305 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 726388 is about 852.2839902286. The cubic root of 726388 is about 89.8923816537.

The spelling of 726388 in words is "seven hundred twenty-six thousand, three hundred eighty-eight".