724091 has 4 divisors (see below), whose sum is σ = 726432. Its totient is φ = 721752.

The previous prime is 724079. The next prime is 724093. The reversal of 724091 is 190427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190427 = 191 ⋅997.

It is a cyclic number.

It is not a de Polignac number, because 724091 - 2¹⁰ = 723067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (181608).

2⁷²⁴⁰⁹¹ is an apocalyptic number.

724091 is a deficient number, since it is larger than the sum of its proper divisors (2341).

724091 is a wasteful number, since it uses less digits than its factorization.

724091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 724091 is about 850.9353676984. The cubic root of 724091 is about 89.7975283834.

The spelling of 724091 in words is "seven hundred twenty-four thousand, ninety-one".