1285136 has 20 divisors (see below), whose sum is σ = 2571264. Its totient is φ = 621600.

The previous prime is 1285129. The next prime is 1285139. The reversal of 1285136 is 6315821.

1285136 is an admirable number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 1791.

2^1285136 is an apocalyptic number.

1285136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1285136 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1285136 is a wasteful number, since it uses less digits than its factorization.

1285136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630 (or 2624 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 1285136 is about 1133.6383903168. The cubic root of 1285136 is about 108.7217322046.

The spelling of 1285136 in words is "one million, two hundred eighty-five thousand, one hundred thirty-six".