669023 has 2 divisors, whose sum is σ = 669024. Its totient is φ = 669022.

The previous prime is 668999. The next prime is 669029. The reversal of 669023 is 320966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669023 - 2⁶ = 668959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668983 and 669001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334511 + 334512.

It is an arithmetic number, because the mean of its divisors is an integer number (334512).

2⁶⁶⁹⁰²³ is an apocalyptic number.

669023 is a deficient number, since it is larger than the sum of its proper divisors (1).

669023 is an equidigital number, since it uses as much as digits as its factorization.

669023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 669023 is about 817.9382617288. The cubic root of 669023 is about 87.4608477899.

Adding to 669023 its reverse (320966), we get a palindrome (989989).

The spelling of 669023 in words is "six hundred sixty-nine thousand, twenty-three".