726420 has 24 divisors (see below), whose sum is σ = 2034144. Its totient is φ = 193696.

The previous prime is 726419. The next prime is 726431. The reversal of 726420 is 24627.

It is a happy number.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5994 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (84756).

2⁷²⁶⁴²⁰ is an apocalyptic number.

It is an amenable number.

726420 is an abundant number, since it is smaller than the sum of its proper divisors (1307724).

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

726420 is a wasteful number, since it uses less digits than its factorization.

726420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12119 (or 12117 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 726420 is about 852.3027631071. The cubic root of 726420 is about 89.8937016617.

The spelling of 726420 in words is "seven hundred twenty-six thousand, four hundred twenty".