1285243848 has 160 divisors (see below), whose sum is σ = 4176532800. Its totient is φ = 361646208.

The previous prime is 1285243829. The next prime is 1285243853. The reversal of 1285243848 is 8483425821.

1285243848 is a `hidden beast` number, since 128 + 52 + 438 + 48 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 301798 + ... + 306026.

It is an arithmetic number, because the mean of its divisors is an integer number (26103330).

Almost surely, 2^1285243848 is an apocalyptic number.

1285243848 is a gapful number since it is divisible by the number (18) 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 1285243848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088266400).

1285243848 is an abundant number, since it is smaller than the sum of its proper divisors (2891288952).

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

1285243848 is a wasteful number, since it uses less digits than its factorization.

1285243848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321 (or 4308 counting only the distinct ones).

The product of its digits is 491520, while the sum is 45.

The square root of 1285243848 is about 35850.2977393494. The cubic root of 1285243848 is about 1087.2477341146.

The spelling of 1285243848 in words is "one billion, two hundred eighty-five million, two hundred forty-three thousand, eight hundred forty-eight".