705440 has 24 divisors (see below), whose sum is σ = 1666980. Its totient is φ = 282112.

The previous prime is 705437. The next prime is 705461. The reversal of 705440 is 44507.

It can be written as a sum of positive squares in 2 ways, for example, as 633616 + 71824 = 796^2 + 268^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 2045 + ... + 2364.

2⁷⁰⁵⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

705440 is an abundant number, since it is smaller than the sum of its proper divisors (961540).

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

705440 is a wasteful number, since it uses less digits than its factorization.

705440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424 (or 4416 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 705440 is about 839.9047565052. The cubic root of 705440 is about 89.0198163172.

Adding to 705440 its reverse (44507), we get a palindrome (749947).

The spelling of 705440 in words is "seven hundred five thousand, four hundred forty".