1638235223 has 2 divisors, whose sum is σ = 1638235224. Its totient is φ = 1638235222.

The previous prime is 1638235219. The next prime is 1638235253. The reversal of 1638235223 is 3225328361.

It is a weak prime.

It is an emirp because it is prime and its reverse (3225328361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1638235223 - 2² = 1638235219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638235213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819117611 + 819117612.

It is an arithmetic number, because the mean of its divisors is an integer number (819117612).

Almost surely, 2^1638235223 is an apocalyptic number.

1638235223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638235223 is an equidigital number, since it uses as much as digits as its factorization.

1638235223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 35.

The square root of 1638235223 is about 40475.1185668430. The cubic root of 1638235223 is about 1178.8505571684.

The spelling of 1638235223 in words is "one billion, six hundred thirty-eight million, two hundred thirty-five thousand, two hundred twenty-three".