705623 has 4 divisors (see below), whose sum is σ = 710448. Its totient is φ = 700800.

The previous prime is 705613. The next prime is 705631. The reversal of 705623 is 326507.

705623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326507 = 79 ⋅4133.

It is a cyclic number.

It is not a de Polignac number, because 705623 - 2⁶ = 705559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705613) 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, 2186 + ... + 2487.

It is an arithmetic number, because the mean of its divisors is an integer number (177612).

2⁷⁰⁵⁶²³ is an apocalyptic number.

705623 is a deficient number, since it is larger than the sum of its proper divisors (4825).

705623 is a wasteful number, since it uses less digits than its factorization.

705623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 705623 is about 840.0136903646. The cubic root of 705623 is about 89.0275132713.

Subtracting from 705623 its sum of digits (23), we obtain a square (705600 = 840²).

The spelling of 705623 in words is "seven hundred five thousand, six hundred twenty-three".