1286280 has 80 divisors (see below), whose sum is σ = 4334220. Its totient is φ = 342144.

The previous prime is 1286273. The next prime is 1286287. The reversal of 1286280 is 826821.

It is an interprime number because it is at equal distance from previous prime (1286273) and next prime (1286287).

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 324 = 1134^2 + 18^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1286287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3042 + ... + 3438.

2^1286280 is an apocalyptic number.

1286280 is a gapful number since it is divisible by the number (10) 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 1286280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167110).

1286280 is an abundant number, since it is smaller than the sum of its proper divisors (3047940).

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

1286280 is a wasteful number, since it uses less digits than its factorization.

1286280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 407 counting only the distinct ones).

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

The square root of 1286280 is about 1134.1428481457. The cubic root of 1286280 is about 108.7539832073.

The spelling of 1286280 in words is "one million, two hundred eighty-six thousand, two hundred eighty".