721846 has 8 divisors (see below), whose sum is σ = 1109304. Its totient is φ = 352080.

The previous prime is 721843. The next prime is 721849. The reversal of 721846 is 648127.

721846 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721843) and next prime (721849).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721843) 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, 4320 + ... + 4483.

It is an arithmetic number, because the mean of its divisors is an integer number (138663).

2⁷²¹⁸⁴⁶ is an apocalyptic number.

721846 is a deficient number, since it is larger than the sum of its proper divisors (387458).

721846 is a wasteful number, since it uses less digits than its factorization.

721846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8846.

The product of its digits is 2688, while the sum is 28.

The square root of 721846 is about 849.6152070202. The cubic root of 721846 is about 89.7046283862.

The spelling of 721846 in words is "seven hundred twenty-one thousand, eight hundred forty-six".