721365 has 8 divisors (see below), whose sum is σ = 1154208. Its totient is φ = 384720.

The previous prime is 721363. The next prime is 721379. The reversal of 721365 is 563127.

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

It is not a de Polignac number, because 721365 - 2¹ = 721363 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721363) 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, 24031 + ... + 24060.

It is an arithmetic number, because the mean of its divisors is an integer number (144276).

2⁷²¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

721365 is a deficient number, since it is larger than the sum of its proper divisors (432843).

721365 is a wasteful number, since it uses less digits than its factorization.

721365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48099.

The product of its digits is 1260, while the sum is 24.

The square root of 721365 is about 849.3320905276. The cubic root of 721365 is about 89.6846991521.

The spelling of 721365 in words is "seven hundred twenty-one thousand, three hundred sixty-five".