1286340 has 48 divisors (see below), whose sum is σ = 3931200. Its totient is φ = 311680.

The previous prime is 1286323. The next prime is 1286359. The reversal of 1286340 is 436821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1286340.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315 + ... + 1634.

It is an arithmetic number, because the mean of its divisors is an integer number (81900).

2^1286340 is an apocalyptic number.

1286340 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 1286340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1965600).

1286340 is an abundant number, since it is smaller than the sum of its proper divisors (2644860).

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

1286340 is a wasteful number, since it uses less digits than its factorization.

1286340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972 (or 1970 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1286340 is about 1134.1692995316. The cubic root of 1286340 is about 108.7556741656.

It can be divided in two parts, 12 and 86340, that multiplied together give a triangular number (1036080 = T₁₄₃₉).

The spelling of 1286340 in words is "one million, two hundred eighty-six thousand, three hundred forty".