726399 has 12 divisors (see below), whose sum is σ = 1074216. Its totient is φ = 472752.

The previous prime is 726391. The next prime is 726413. The reversal of 726399 is 993627.

It is not a de Polignac number, because 726399 - 2³ = 726391 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726391) 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 11 ways as a sum of consecutive naturals, for example, 552 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (89518).

2⁷²⁶³⁹⁹ is an apocalyptic number.

726399 is a deficient number, since it is larger than the sum of its proper divisors (347817).

726399 is a wasteful number, since it uses less digits than its factorization.

726399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926 (or 1923 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 726399 is about 852.2904434522. The cubic root of 726399 is about 89.8928354108.

The spelling of 726399 in words is "seven hundred twenty-six thousand, three hundred ninety-nine".