726381 has 8 divisors (see below), whose sum is σ = 1076160. Its totient is φ = 484236.

The previous prime is 726379. The next prime is 726391. The reversal of 726381 is 183627.

It is not a de Polignac number, because 726381 - 2¹ = 726379 is a prime.

It is a super-2 number, since 2×726381² = 1055258714322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 26903 = 726381 / (7 + 2 + 6 + 3 + 8 + 1).

726381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13425 + ... + 13478.

It is an arithmetic number, because the mean of its divisors is an integer number (134520).

2⁷²⁶³⁸¹ is an apocalyptic number.

It is an amenable number.

726381 is a deficient number, since it is larger than the sum of its proper divisors (349779).

726381 is a wasteful number, since it uses less digits than its factorization.

726381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26912 (or 26906 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 726381 is about 852.2798836063. The cubic root of 726381 is about 89.8920928968.

The spelling of 726381 in words is "seven hundred twenty-six thousand, three hundred eighty-one".