731340 has 72 divisors (see below), whose sum is σ = 2358720. Its totient is φ = 182784.

The previous prime is 731333. The next prime is 731359. The reversal of 731340 is 43137.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2941 + ... + 3179.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2⁷³¹³⁴⁰ 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 731340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179360).

731340 is an abundant number, since it is smaller than the sum of its proper divisors (1627380).

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

731340 is a wasteful number, since it uses less digits than its factorization.

731340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 731340 is about 855.1841906864. The cubic root of 731340 is about 90.0961934466.

Adding to 731340 its reverse (43137), we get a palindrome (774477).

The spelling of 731340 in words is "seven hundred thirty-one thousand, three hundred forty".