1280286 has 40 divisors (see below), whose sum is σ = 3281520. Its totient is φ = 365472.

The previous prime is 1280281. The next prime is 1280291. The reversal of 1280286 is 6820821.

It is an interprime number because it is at equal distance from previous prime (1280281) and next prime (1280291).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280281) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 570 + ... + 1698.

It is an arithmetic number, because the mean of its divisors is an integer number (82038).

2^1280286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1640760).

1280286 is an abundant number, since it is smaller than the sum of its proper divisors (2001234).

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

1280286 is a wasteful number, since it uses less digits than its factorization.

1280286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1280286 is about 1131.4972381760. The cubic root of 1280286 is about 108.5847907641.

The spelling of 1280286 in words is "one million, two hundred eighty thousand, two hundred eighty-six".