1265863 has 2 divisors, whose sum is σ = 1265864. Its totient is φ = 1265862.

The previous prime is 1265861. The next prime is 1265867. The reversal of 1265863 is 3685621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265863 - 2¹ = 1265861 is a prime.

Together with 1265861, 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 (1265861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632931 + 632932.

It is an arithmetic number, because the mean of its divisors is an integer number (632932).

2^1265863 is an apocalyptic number.

1265863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265863 is an equidigital number, since it uses as much as digits as its factorization.

1265863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 1265863 is about 1125.1057728054. The cubic root of 1265863 is about 108.1754977016.

It can be divided in two parts, 12658 and 63, that added together give a palindrome (12721).

The spelling of 1265863 in words is "one million, two hundred sixty-five thousand, eight hundred sixty-three".