724491 has 8 divisors (see below), whose sum is σ = 1073360. Its totient is φ = 482976.

The previous prime is 724487. The next prime is 724499. The reversal of 724491 is 194427.

It is a happy number.

724491 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 724491 - 2² = 724487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 26833 = 724491 / (7 + 2 + 4 + 4 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13390 + ... + 13443.

It is an arithmetic number, because the mean of its divisors is an integer number (134170).

2⁷²⁴⁴⁹¹ is an apocalyptic number.

724491 is a deficient number, since it is larger than the sum of its proper divisors (348869).

724491 is a wasteful number, since it uses less digits than its factorization.

724491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26842 (or 26836 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 724491 is about 851.1703707249. The cubic root of 724491 is about 89.8140605593.

The spelling of 724491 in words is "seven hundred twenty-four thousand, four hundred ninety-one".