657923 has 12 divisors (see below), whose sum is σ = 793440. Its totient is φ = 543312.

The previous prime is 657911. The next prime is 657929. The reversal of 657923 is 329756.

It is not a de Polignac number, because 657923 - 2¹⁶ = 592387 is a prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 657923.

It is not an unprimeable number, because it can be changed into a prime (657929) 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, 1190 + ... + 1652.

It is an arithmetic number, because the mean of its divisors is an integer number (66120).

2⁶⁵⁷⁹²³ is an apocalyptic number.

657923 is a deficient number, since it is larger than the sum of its proper divisors (135517).

657923 is a wasteful number, since it uses less digits than its factorization.

657923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 499 counting only the distinct ones).

The product of its digits is 11340, while the sum is 32.

The square root of 657923 is about 811.1245280473. The cubic root of 657923 is about 86.9744497129.

The spelling of 657923 in words is "six hundred fifty-seven thousand, nine hundred twenty-three".