724985 has 8 divisors (see below), whose sum is σ = 884616. Its totient is φ = 570240.

The previous prime is 724967. The next prime is 724991. The reversal of 724985 is 589427.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 784 + 724201 = 28^2 + 851^2 .

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

It is not a de Polignac number, because 724985 - 2⁸ = 724729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (110577).

2⁷²⁴⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

724985 is a deficient number, since it is larger than the sum of its proper divisors (159631).

724985 is a wasteful number, since it uses less digits than its factorization.

724985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443.

The product of its digits is 20160, while the sum is 35.

The square root of 724985 is about 851.4605099475. The cubic root of 724985 is about 89.8344694005.

The spelling of 724985 in words is "seven hundred twenty-four thousand, nine hundred eighty-five".