1261226862 has 112 divisors (see below), whose sum is σ = 3263680512. Its totient is φ = 357909840.

The previous prime is 1261226861. The next prime is 1261226867. The reversal of 1261226862 is 2686221621.

It is a happy number.

1261226862 is a `hidden beast` number, since 12 + 612 + 26 + 8 + 6 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261226861) 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 in 55 ways as a sum of consecutive naturals, for example, 1949023 + ... + 1949669.

Almost surely, 2^1261226862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261226862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1631840256).

1261226862 is an abundant number, since it is smaller than the sum of its proper divisors (2002453650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261226862 is an equidigital number, since it uses as much as digits as its factorization.

1261226862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 850 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1261226862 is about 35513.7559545594. The cubic root of 1261226862 is about 1080.4327432484.

The spelling of 1261226862 in words is "one billion, two hundred sixty-one million, two hundred twenty-six thousand, eight hundred sixty-two".