1285385682 has 128 divisors (see below), whose sum is σ = 3284582400. Its totient is φ = 326880576.

The previous prime is 1285385677. The next prime is 1285385707. The reversal of 1285385682 is 2865835821.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1082293 + ... + 1083479.

It is an arithmetic number, because the mean of its divisors is an integer number (25660800).

Almost surely, 2^1285385682 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285385682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1642291200).

1285385682 is an abundant number, since it is smaller than the sum of its proper divisors (1999196718).

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

1285385682 is a wasteful number, since it uses less digits than its factorization.

1285385682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300.

The product of its digits is 921600, while the sum is 48.

The square root of 1285385682 is about 35852.2758273446. The cubic root of 1285385682 is about 1087.2877273094.

The spelling of 1285385682 in words is "one billion, two hundred eighty-five million, three hundred eighty-five thousand, six hundred eighty-two".