1275785742 has 128 divisors (see below), whose sum is σ = 3384115200. Its totient is φ = 310608000.

The previous prime is 1275785729. The next prime is 1275785743. The reversal of 1275785742 is 2475875721.

It is a junction number, because it is equal to n+sod(n) for n = 1275785691 and 1275785700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275785743) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 885859 + ... + 887297.

It is an arithmetic number, because the mean of its divisors is an integer number (26438400).

Almost surely, 2^1275785742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1275785742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1692057600).

1275785742 is an abundant number, since it is smaller than the sum of its proper divisors (2108329458).

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

1275785742 is a wasteful number, since it uses less digits than its factorization.

1275785742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582.

The product of its digits is 1097600, while the sum is 48.

The square root of 1275785742 is about 35718.1430368377. The cubic root of 1275785742 is about 1084.5741473327.

The spelling of 1275785742 in words is "one billion, two hundred seventy-five million, seven hundred eighty-five thousand, seven hundred forty-two".