1286838 has 36 divisors (see below), whose sum is σ = 3245580. Its totient is φ = 367416.

The previous prime is 1286837. The next prime is 1286839. The reversal of 1286838 is 8386821.

It is an interprime number because it is at equal distance from previous prime (1286837) and next prime (1286839).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 153 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (90155).

2^1286838 is an apocalyptic number.

1286838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1622790).

1286838 is an abundant number, since it is smaller than the sum of its proper divisors (1958742).

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

1286838 is a wasteful number, since it uses less digits than its factorization.

1286838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1471 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 1286838 is about 1134.3888222298. The cubic root of 1286838 is about 108.7697070905.

The spelling of 1286838 in words is "one million, two hundred eighty-six thousand, eight hundred thirty-eight".