1286240 has 24 divisors (see below), whose sum is σ = 3039120. Its totient is φ = 514432.

The previous prime is 1286239. The next prime is 1286261. The reversal of 1286240 is 426821.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3860 + ... + 4179.

It is an arithmetic number, because the mean of its divisors is an integer number (126630).

2^1286240 is an apocalyptic number.

1286240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286240 is an abundant number, since it is smaller than the sum of its proper divisors (1752880).

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

1286240 is an equidigital number, since it uses as much as digits as its factorization.

1286240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054 (or 8046 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1286240 is about 1134.1252135457. The cubic root of 1286240 is about 108.7528558725.

The spelling of 1286240 in words is "one million, two hundred eighty-six thousand, two hundred forty".