649423 has 2 divisors, whose sum is σ = 649424. Its totient is φ = 649422.

The previous prime is 649421. The next prime is 649427. The reversal of 649423 is 324946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649423 - 2¹ = 649421 is a prime.

Together with 649421, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 649391 and 649400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324711 + 324712.

It is an arithmetic number, because the mean of its divisors is an integer number (324712).

2⁶⁴⁹⁴²³ is an apocalyptic number.

649423 is a deficient number, since it is larger than the sum of its proper divisors (1).

649423 is an equidigital number, since it uses as much as digits as its factorization.

649423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 649423 is about 805.8678551723. The cubic root of 649423 is about 86.5982711530.

The spelling of 649423 in words is "six hundred forty-nine thousand, four hundred twenty-three".