720843 has 16 divisors (see below), whose sum is σ = 1038336. Its totient is φ = 443520.

The previous prime is 720829. The next prime is 720847. The reversal of 720843 is 348027.

It is not a de Polignac number, because 720843 - 2⁶ = 720779 is a prime.

It is a super-2 number, since 2×720843² = 1039229261298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (720847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1971 + ... + 2307.

It is an arithmetic number, because the mean of its divisors is an integer number (64896).

2⁷²⁰⁸⁴³ is an apocalyptic number.

720843 is a deficient number, since it is larger than the sum of its proper divisors (317493).

720843 is a wasteful number, since it uses less digits than its factorization.

720843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 720843 is about 849.0247346220. The cubic root of 720843 is about 89.6630611419.

Subtracting from 720843 its reverse (348027), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 720843 in words is "seven hundred twenty thousand, eight hundred forty-three".