726390861 has 8 divisors (see below), whose sum is σ = 1106881344. Its totient is φ = 415080480.

The previous prime is 726390857. The next prime is 726390877. The reversal of 726390861 is 168093627.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 726390861 - 2² = 726390857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726390461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17295000 + ... + 17295041.

It is an arithmetic number, because the mean of its divisors is an integer number (138360168).

Almost surely, 2^726390861 is an apocalyptic number.

It is an amenable number.

726390861 is a deficient number, since it is larger than the sum of its proper divisors (380490483).

726390861 is a wasteful number, since it uses less digits than its factorization.

726390861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34590051.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 726390861 is about 26951.6393007921. The cubic root of 726390861 is about 898.9249967225.

The spelling of 726390861 in words is "seven hundred twenty-six million, three hundred ninety thousand, eight hundred sixty-one".