1278486 has 36 divisors (see below), whose sum is σ = 3049956. Its totient is φ = 386760.

The previous prime is 1278481. The next prime is 1278493. The reversal of 1278486 is 6848721.

It is a self number, because there is not a number n which added to its sum of digits gives 1278486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278481) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1885 + ... + 2471.

It is an arithmetic number, because the mean of its divisors is an integer number (84721).

2^1278486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524978).

1278486 is an abundant number, since it is smaller than the sum of its proper divisors (1771470).

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

1278486 is a wasteful number, since it uses less digits than its factorization.

1278486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 603 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1278486 is about 1130.7015521348. The cubic root of 1278486 is about 108.5338791467.

It can be divided in two parts, 1278 and 486, that added together give a square (1764 = 42²).

The spelling of 1278486 in words is "one million, two hundred seventy-eight thousand, four hundred eighty-six".