1285868250 has 128 divisors (see below), whose sum is σ = 3587950080. Its totient is φ = 340804800.

The previous prime is 1285868237. The next prime is 1285868257. The reversal of 1285868250 is 528685821.

1285868250 is a `hidden beast` number, since 12 + 8 + 586 + 8 + 2 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1285868196 and 1285868205.

It is not an unprimeable number, because it can be changed into a prime (1285868257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1329267 + ... + 1330233.

It is an arithmetic number, because the mean of its divisors is an integer number (28030860).

Almost surely, 2^1285868250 is an apocalyptic number.

1285868250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285868250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793975040).

1285868250 is an abundant number, since it is smaller than the sum of its proper divisors (2302081830).

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

1285868250 is a wasteful number, since it uses less digits than its factorization.

1285868250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 1285868250 is about 35859.0051451515. The cubic root of 1285868250 is about 1087.4237758703.

The spelling of 1285868250 in words is "one billion, two hundred eighty-five million, eight hundred sixty-eight thousand, two hundred fifty".