705240 has 64 divisors (see below), whose sum is σ = 2354400. Its totient is φ = 187776.

The previous prime is 705209. The next prime is 705247. The reversal of 705240 is 42507.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754 + ... + 1406.

2⁷⁰⁵²⁴⁰ 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 705240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177200).

705240 is an abundant number, since it is smaller than the sum of its proper divisors (1649160).

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

705240 is a wasteful number, since it uses less digits than its factorization.

705240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 705240 is about 839.7856869464. The cubic root of 705240 is about 89.0114028230.

Adding to 705240 its reverse (42507), we get a palindrome (747747).

The spelling of 705240 in words is "seven hundred five thousand, two hundred forty".