1226788863 has 4 divisors (see below), whose sum is σ = 1635718488. Its totient is φ = 817859240.

The previous prime is 1226788861. The next prime is 1226788879. The reversal of 1226788863 is 3688876221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1226788863 - 2¹ = 1226788861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226788861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204464808 + ... + 204464813.

It is an arithmetic number, because the mean of its divisors is an integer number (408929622).

Almost surely, 2^1226788863 is an apocalyptic number.

1226788863 is a deficient number, since it is larger than the sum of its proper divisors (408929625).

1226788863 is an equidigital number, since it uses as much as digits as its factorization.

1226788863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408929624.

The product of its digits is 1548288, while the sum is 51.

The square root of 1226788863 is about 35025.5458629841. The cubic root of 1226788863 is about 1070.5080601762.

The spelling of 1226788863 in words is "one billion, two hundred twenty-six million, seven hundred eighty-eight thousand, eight hundred sixty-three".