724140 has 72 divisors (see below), whose sum is σ = 2293200. Its totient is φ = 191808.

The previous prime is 724123. The next prime is 724153. The reversal of 724140 is 41427.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

724140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4786 + ... + 4934.

It is an arithmetic number, because the mean of its divisors is an integer number (31850).

2⁷²⁴¹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 724140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146600).

724140 is an abundant number, since it is smaller than the sum of its proper divisors (1569060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

724140 is a wasteful number, since it uses less digits than its factorization.

724140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 724140 is about 850.9641590572. The cubic root of 724140 is about 89.7995539021.

Adding to 724140 its reverse (41427), we get a palindrome (765567).

The spelling of 724140 in words is "seven hundred twenty-four thousand, one hundred forty", and thus it is an iban number.