1285170726 has 96 divisors (see below), whose sum is σ = 3233820672. Its totient is φ = 338177280.

The previous prime is 1285170703. The next prime is 1285170727. The reversal of 1285170726 is 6270715821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285170727) 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 47 ways as a sum of consecutive naturals, for example, 232171 + ... + 237641.

It is an arithmetic number, because the mean of its divisors is an integer number (33685632).

Almost surely, 2^1285170726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285170726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616910336).

1285170726 is an abundant number, since it is smaller than the sum of its proper divisors (1948649946).

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

1285170726 is a wasteful number, since it uses less digits than its factorization.

1285170726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554 (or 5547 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 1285170726 is about 35849.2779006774. The cubic root of 1285170726 is about 1087.2271146198.

The spelling of 1285170726 in words is "one billion, two hundred eighty-five million, one hundred seventy thousand, seven hundred twenty-six".