709623 has 12 divisors (see below), whose sum is σ = 1053208. Its totient is φ = 460080.

The previous prime is 709609. The next prime is 709649. The reversal of 709623 is 326907.

It is not a de Polignac number, because 709623 - 2⁴ = 709607 is a prime.

It is a Duffinian number.

709623 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709603) 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, 733 + ... + 1398.

2⁷⁰⁹⁶²³ is an apocalyptic number.

709623 is a deficient number, since it is larger than the sum of its proper divisors (343585).

709623 is a wasteful number, since it uses less digits than its factorization.

709623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 709623 is about 842.3912392707. The cubic root of 709623 is about 89.1954212829.

The spelling of 709623 in words is "seven hundred nine thousand, six hundred twenty-three".