263638423 has 2 divisors, whose sum is σ = 263638424. Its totient is φ = 263638422.

The previous prime is 263638421. The next prime is 263638429. The reversal of 263638423 is 324836362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263638423 - 2¹ = 263638421 is a prime.

Together with 263638421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263638421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131819211 + 131819212.

It is an arithmetic number, because the mean of its divisors is an integer number (131819212).

Almost surely, 2^263638423 is an apocalyptic number.

263638423 is a deficient number, since it is larger than the sum of its proper divisors (1).

263638423 is an equidigital number, since it uses as much as digits as its factorization.

263638423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 37.

The square root of 263638423 is about 16236.9462338212. The cubic root of 263638423 is about 641.2138608170.

The spelling of 263638423 in words is "two hundred sixty-three million, six hundred thirty-eight thousand, four hundred twenty-three".