730840 has 48 divisors (see below), whose sum is σ = 1819440. Its totient is φ = 264000.

The previous prime is 730837. The next prime is 730843. The reversal of 730840 is 48037.

730840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (730837) and next prime (730843).

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4765 + ... + 4915.

It is an arithmetic number, because the mean of its divisors is an integer number (37905).

2⁷³⁰⁸⁴⁰ 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 730840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909720).

730840 is an abundant number, since it is smaller than the sum of its proper divisors (1088600).

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

730840 is a wasteful number, since it uses less digits than its factorization.

730840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 730840 is about 854.8918060199. The cubic root of 730840 is about 90.0756565478.

Adding to 730840 its reverse (48037), we get a palindrome (778877).

The spelling of 730840 in words is "seven hundred thirty thousand, eight hundred forty".