1285428 has 12 divisors (see below), whose sum is σ = 2999360. Its totient is φ = 428472.

The previous prime is 1285411. The next prime is 1285429. The reversal of 1285428 is 8245821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1285395 and 1285404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285429) 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 3 ways as a sum of consecutive naturals, for example, 53548 + ... + 53571.

2^1285428 is an apocalyptic number.

It is an amenable number.

1285428 is an abundant number, since it is smaller than the sum of its proper divisors (1713932).

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

1285428 is a wasteful number, since it uses less digits than its factorization.

1285428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107126 (or 107124 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

The square root of 1285428 is about 1133.7671718655. The cubic root of 1285428 is about 108.7299659224.

The spelling of 1285428 in words is "one million, two hundred eighty-five thousand, four hundred twenty-eight".