721007 has 4 divisors (see below), whose sum is σ = 824016. Its totient is φ = 618000.

The previous prime is 721003. The next prime is 721013. The reversal of 721007 is 700127.

It is a happy number.

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 721007 - 2² = 721003 is a prime.

It is a super-3 number, since 3×721007³ = 1124448833300962029, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721003) 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, 51494 + ... + 51507.

It is an arithmetic number, because the mean of its divisors is an integer number (206004).

2⁷²¹⁰⁰⁷ is an apocalyptic number.

721007 is a deficient number, since it is larger than the sum of its proper divisors (103009).

721007 is a wasteful number, since it uses less digits than its factorization.

721007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103008.

The product of its (nonzero) digits is 98, while the sum is 17.

The square root of 721007 is about 849.1213105322. The cubic root of 721007 is about 89.6698604158.

The spelling of 721007 in words is "seven hundred twenty-one thousand, seven", and thus it is an iban number.