663923 has 4 divisors (see below), whose sum is σ = 715008. Its totient is φ = 612840.

The previous prime is 663907. The next prime is 663937. The reversal of 663923 is 329366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329366 = 2 ⋅164683.

It is a cyclic number.

It is not a de Polignac number, because 663923 - 2⁴ = 663907 is a prime.

It is a d-powerful number, because it can be written as 6 + 6⁴ + 9² + 3³ + 2¹⁷ + 3¹² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663973) 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, 25523 + ... + 25548.

It is an arithmetic number, because the mean of its divisors is an integer number (178752).

2⁶⁶³⁹²³ is an apocalyptic number.

663923 is a deficient number, since it is larger than the sum of its proper divisors (51085).

663923 is a wasteful number, since it uses less digits than its factorization.

663923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51084.

The product of its digits is 5832, while the sum is 29.

The square root of 663923 is about 814.8147028619. The cubic root of 663923 is about 87.2380410152.

The spelling of 663923 in words is "six hundred sixty-three thousand, nine hundred twenty-three".