724891 has 4 divisors (see below), whose sum is σ = 756432. Its totient is φ = 693352.

The previous prime is 724879. The next prime is 724901. The reversal of 724891 is 198427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-724891 is a prime.

It is a Duffinian number.

724891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (724291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15736 + ... + 15781.

It is an arithmetic number, because the mean of its divisors is an integer number (189108).

2⁷²⁴⁸⁹¹ is an apocalyptic number.

724891 is a deficient number, since it is larger than the sum of its proper divisors (31541).

724891 is a wasteful number, since it uses less digits than its factorization.

724891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31540.

The product of its digits is 4032, while the sum is 31.

The square root of 724891 is about 851.4053088864. The cubic root of 724891 is about 89.8305866512.

The spelling of 724891 in words is "seven hundred twenty-four thousand, eight hundred ninety-one".