726805381 has 4 divisors (see below), whose sum is σ = 728323200. Its totient is φ = 725287564.

The previous prime is 726805357. The next prime is 726805397. The reversal of 726805381 is 183508627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 726805381 - 2¹³ = 726797189 is a prime.

It is a super-2 number, since 2×726805381² = 1056492123701110322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726805181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758191 + ... + 759148.

It is an arithmetic number, because the mean of its divisors is an integer number (182080800).

Almost surely, 2^726805381 is an apocalyptic number.

It is an amenable number.

726805381 is a deficient number, since it is larger than the sum of its proper divisors (1517819).

726805381 is a wasteful number, since it uses less digits than its factorization.

726805381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517818.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 726805381 is about 26959.3282742727. The cubic root of 726805381 is about 899.0959568086.

The spelling of 726805381 in words is "seven hundred twenty-six million, eight hundred five thousand, three hundred eighty-one".