726390 has 48 divisors (see below), whose sum is σ = 2160288. Its totient is φ = 165888.

The previous prime is 726379. The next prime is 726391. The reversal of 726390 is 93627.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct 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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54 + ... + 1206.

It is an arithmetic number, because the mean of its divisors is an integer number (45006).

2⁷²⁶³⁹⁰ is an apocalyptic number.

726390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 726390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1080144).

726390 is an abundant number, since it is smaller than the sum of its proper divisors (1433898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726390 is a wasteful number, since it uses less digits than its factorization.

726390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 726390 is about 852.2851635456. The cubic root of 726390 is about 89.8924641553.

The spelling of 726390 in words is "seven hundred twenty-six thousand, three hundred ninety".