667423 has 2 divisors, whose sum is σ = 667424. Its totient is φ = 667422.

The previous prime is 667421. The next prime is 667427. The reversal of 667423 is 324766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667423 - 2¹ = 667421 is a prime.

Together with 667421, it forms a pair of twin primes.

667423 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 667391 and 667400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333711 + 333712.

It is an arithmetic number, because the mean of its divisors is an integer number (333712).

2⁶⁶⁷⁴²³ is an apocalyptic number.

667423 is a deficient number, since it is larger than the sum of its proper divisors (1).

667423 is an equidigital number, since it uses as much as digits as its factorization.

667423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 667423 is about 816.9596073246. The cubic root of 667423 is about 87.3910698897.

The spelling of 667423 in words is "six hundred sixty-seven thousand, four hundred twenty-three".