905623 has 4 divisors (see below), whose sum is σ = 926728. Its totient is φ = 884520.

The previous prime is 905621. The next prime is 905629. The reversal of 905623 is 326509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326509 = 47 ⋅6947.

It is a cyclic number.

It is not a de Polignac number, because 905623 - 2¹ = 905621 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 (905621) 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, 10488 + ... + 10573.

It is an arithmetic number, because the mean of its divisors is an integer number (231682).

2⁹⁰⁵⁶²³ is an apocalyptic number.

905623 is a deficient number, since it is larger than the sum of its proper divisors (21105).

905623 is a wasteful number, since it uses less digits than its factorization.

905623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21104.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 905623 is about 951.6422647193. The cubic root of 905623 is about 96.7495932608.

The spelling of 905623 in words is "nine hundred five thousand, six hundred twenty-three".