1263439823 has 2 divisors, whose sum is σ = 1263439824. Its totient is φ = 1263439822.

The previous prime is 1263439769. The next prime is 1263439831. The reversal of 1263439823 is 3289343621.

It is a strong prime.

It is an emirp because it is prime and its reverse (3289343621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263439823 - 2¹² = 1263435727 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263439873) 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, 631719911 + 631719912.

It is an arithmetic number, because the mean of its divisors is an integer number (631719912).

Almost surely, 2^1263439823 is an apocalyptic number.

1263439823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263439823 is an equidigital number, since it uses as much as digits as its factorization.

1263439823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 1263439823 is about 35544.8986916548. The cubic root of 1263439823 is about 1081.0642866446.

The spelling of 1263439823 in words is "one billion, two hundred sixty-three million, four hundred thirty-nine thousand, eight hundred twenty-three".