724945 has 16 divisors (see below), whose sum is σ = 987840. Its totient is φ = 506304.

The previous prime is 724939. The next prime is 724949. The reversal of 724945 is 549427.

It is a cyclic number.

It is not a de Polignac number, because 724945 - 2⁹ = 724433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (724949) 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 15 ways as a sum of consecutive naturals, for example, 942 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (61740).

2⁷²⁴⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

724945 is a deficient number, since it is larger than the sum of its proper divisors (262895).

724945 is a wasteful number, since it uses less digits than its factorization.

724945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624.

The product of its digits is 10080, while the sum is 31.

The square root of 724945 is about 851.4370205717. The cubic root of 724945 is about 89.8328172078.

The spelling of 724945 in words is "seven hundred twenty-four thousand, nine hundred forty-five".