721598 has 8 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 358720.

The previous prime is 721597. The next prime is 721613. The reversal of 721598 is 895127.

721598 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721598.

It is not an unprimeable number, because it can be changed into a prime (721597) 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, 563 + ... + 1326.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2⁷²¹⁵⁹⁸ is an apocalyptic number.

721598 is a deficient number, since it is larger than the sum of its proper divisors (367042).

721598 is a wasteful number, since it uses less digits than its factorization.

721598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082.

The product of its digits is 5040, while the sum is 32.

The square root of 721598 is about 849.4692460590. The cubic root of 721598 is about 89.6943541282.

The spelling of 721598 in words is "seven hundred twenty-one thousand, five hundred ninety-eight".