1286428 has 36 divisors (see below), whose sum is σ = 2674728. Its totient is φ = 536640.

The previous prime is 1286419. The next prime is 1286447. The reversal of 1286428 is 8246821.

It is a self number, because there is not a number n which added to its sum of digits gives 1286428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7350 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (74298).

2^1286428 is an apocalyptic number.

It is an amenable number.

1286428 is an abundant number, since it is smaller than the sum of its proper divisors (1388300).

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

1286428 is a wasteful number, since it uses less digits than its factorization.

1286428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 199 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 1286428 is about 1134.2080937817. The cubic root of 1286428 is about 108.7581541426.

It can be divided in two parts, 128 and 6428, that added together give a palindrome (6556).

The spelling of 1286428 in words is "one million, two hundred eighty-six thousand, four hundred twenty-eight".