709040 has 20 divisors (see below), whose sum is σ = 1648704. Its totient is φ = 283584.

The previous prime is 708997. The next prime is 709043. The reversal of 709040 is 40907.

It is a tau number, because it is divible by the number of its divisors (20).

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

It is not an unprimeable number, because it can be changed into a prime (709043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4352 + ... + 4511.

2⁷⁰⁹⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

709040 is an abundant number, since it is smaller than the sum of its proper divisors (939664).

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

709040 is a wasteful number, since it uses less digits than its factorization.

709040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8876 (or 8870 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 709040 is about 842.0451294319. The cubic root of 709040 is about 89.1709880380.

Adding to 709040 its reverse (40907), we get a palindrome (749947).

The spelling of 709040 in words is "seven hundred nine thousand, forty".