1261726242 has 16 divisors (see below), whose sum is σ = 2883945792. Its totient is φ = 360493200.

The previous prime is 1261726237. The next prime is 1261726289. The reversal of 1261726242 is 2426271621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15020509 + ... + 15020592.

It is an arithmetic number, because the mean of its divisors is an integer number (180246612).

Almost surely, 2^1261726242 is an apocalyptic number.

1261726242 is an abundant number, since it is smaller than the sum of its proper divisors (1622219550).

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

1261726242 is a wasteful number, since it uses less digits than its factorization.

1261726242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30041113.

The product of its digits is 16128, while the sum is 33.

The square root of 1261726242 is about 35520.7860554915. The cubic root of 1261726242 is about 1080.5753227542.

Adding to 1261726242 its reverse (2426271621), we get a palindrome (3687997863).

The spelling of 1261726242 in words is "one billion, two hundred sixty-one million, seven hundred twenty-six thousand, two hundred forty-two".