724340 has 12 divisors (see below), whose sum is σ = 1521156. Its totient is φ = 289728.

The previous prime is 724331. The next prime is 724393. The reversal of 724340 is 43427.

It is a happy number.

724340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 164836 + 559504 = 406^2 + 748^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 36217 = 724340 / (7 + 2 + 4 + 3 + 4 + 0).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18089 + ... + 18128.

It is an arithmetic number, because the mean of its divisors is an integer number (126763).

2⁷²⁴³⁴⁰ is an apocalyptic number.

It is an amenable number.

724340 is an abundant number, since it is smaller than the sum of its proper divisors (796816).

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

724340 is a wasteful number, since it uses less digits than its factorization.

724340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36226 (or 36224 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 724340 is about 851.0816647067. The cubic root of 724340 is about 89.8078203780.

Adding to 724340 its reverse (43427), we get a palindrome (767767).

The spelling of 724340 in words is "seven hundred twenty-four thousand, three hundred forty", and thus it is an iban number.