637423 has 2 divisors, whose sum is σ = 637424. Its totient is φ = 637422.

The previous prime is 637421. The next prime is 637447. The reversal of 637423 is 324736.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 637423 - 2¹ = 637421 is a prime.

Together with 637421, it forms a pair of twin primes.

637423 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318711 + 318712.

It is an arithmetic number, because the mean of its divisors is an integer number (318712).

2⁶³⁷⁴²³ is an apocalyptic number.

637423 is a deficient number, since it is larger than the sum of its proper divisors (1).

637423 is an equidigital number, since it uses as much as digits as its factorization.

637423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 25.

The square root of 637423 is about 798.3877504070. The cubic root of 637423 is about 86.0615657949.

The spelling of 637423 in words is "six hundred thirty-seven thousand, four hundred twenty-three".