1285988 has 18 divisors (see below), whose sum is σ = 2474598. Its totient is φ = 584320.

The previous prime is 1285981. The next prime is 1285993. The reversal of 1285988 is 8895821.

It can be written as a sum of positive squares in only one way, i.e., 1162084 + 123904 = 1078^2 + 352^2 .

It is a super-2 number, since 2×1285988² = 3307530272288, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1285981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 845 + ... + 1812.

2^1285988 is an apocalyptic number.

It is an amenable number.

1285988 is a deficient number, since it is larger than the sum of its proper divisors (1188610).

1285988 is a wasteful number, since it uses less digits than its factorization.

1285988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683 (or 2670 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 1285988 is about 1134.0141092597. The cubic root of 1285988 is about 108.7457531261.

It can be divided in two parts, 128 and 5988, that added together give a palindrome (6116).

The spelling of 1285988 in words is "one million, two hundred eighty-five thousand, nine hundred eighty-eight".