1285260912 has 160 divisors (see below), whose sum is σ = 4005576960. Its totient is φ = 392221440.

The previous prime is 1285260881. The next prime is 1285260917. The reversal of 1285260912 is 2190625821.

1285260912 is a `hidden beast` number, since 128 + 526 + 0 + 9 + 1 + 2 = 666.

It is a super-2 number, since 2×1285260912² = 3303791223830143488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285260917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734823 + ... + 736569.

It is an arithmetic number, because the mean of its divisors is an integer number (25034856).

Almost surely, 2^1285260912 is an apocalyptic number.

1285260912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285260912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2002788480).

1285260912 is an abundant number, since it is smaller than the sum of its proper divisors (2720316048).

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

1285260912 is a wasteful number, since it uses less digits than its factorization.

1285260912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908 (or 1896 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1285260912 is about 35850.5357282147. The cubic root of 1285260912 is about 1087.2525458379.

The spelling of 1285260912 in words is "one billion, two hundred eighty-five million, two hundred sixty thousand, nine hundred twelve".