721367 has 4 divisors (see below), whose sum is σ = 724200. Its totient is φ = 718536.

The previous prime is 721363. The next prime is 721379. The reversal of 721367 is 763127.

721367 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721367 - 2² = 721363 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 992 + ... + 1557.

It is an arithmetic number, because the mean of its divisors is an integer number (181050).

2⁷²¹³⁶⁷ is an apocalyptic number.

721367 is a deficient number, since it is larger than the sum of its proper divisors (2833).

721367 is a wasteful number, since it uses less digits than its factorization.

721367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832.

The product of its digits is 1764, while the sum is 26.

The square root of 721367 is about 849.3332679226. Note that the first 3 decimals coincide. The cubic root of 721367 is about 89.6847820363.

The spelling of 721367 in words is "seven hundred twenty-one thousand, three hundred sixty-seven".