1261796536 has 128 divisors (see below), whose sum is σ = 3344140800. Its totient is φ = 429857280.

The previous prime is 1261796531. The next prime is 1261796551. The reversal of 1261796536 is 6356971621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261796531) 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 31 ways as a sum of consecutive naturals, for example, 148006 + ... + 156298.

It is an arithmetic number, because the mean of its divisors is an integer number (26126100).

Almost surely, 2^1261796536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261796536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1672070400).

1261796536 is an abundant number, since it is smaller than the sum of its proper divisors (2082344264).

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

1261796536 is a wasteful number, since it uses less digits than its factorization.

1261796536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8349 (or 8345 counting only the distinct ones).

The product of its digits is 408240, while the sum is 46.

The square root of 1261796536 is about 35521.7755186871. The cubic root of 1261796536 is about 1080.5953895877.

It can be divided in two parts, 1261 and 796536, that added together give a palindrome (797797).

The spelling of 1261796536 in words is "one billion, two hundred sixty-one million, seven hundred ninety-six thousand, five hundred thirty-six".