1285811448 has 32 divisors (see below), whose sum is σ = 3215506560. Its totient is φ = 428473440.

The previous prime is 1285811447. The next prime is 1285811467. The reversal of 1285811448 is 8441185821.

It is a super-2 number, since 2×1285811448² = 3306622159615713408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285811447) 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 7 ways as a sum of consecutive naturals, for example, 103743 + ... + 115473.

It is an arithmetic number, because the mean of its divisors is an integer number (100484580).

Almost surely, 2^1285811448 is an apocalyptic number.

It is an amenable number.

1285811448 is an abundant number, since it is smaller than the sum of its proper divisors (1929695112).

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

1285811448 is a wasteful number, since it uses less digits than its factorization.

1285811448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307 (or 16303 counting only the distinct ones).

The product of its digits is 81920, while the sum is 42.

The square root of 1285811448 is about 35858.2131177782. The cubic root of 1285811448 is about 1087.4077636662.

The spelling of 1285811448 in words is "one billion, two hundred eighty-five million, eight hundred eleven thousand, four hundred forty-eight".