1285506 has 24 divisors (see below), whose sum is σ = 2949804. Its totient is φ = 403200.

The previous prime is 1285481. The next prime is 1285507. The reversal of 1285506 is 6055821.

It can be written as a sum of positive squares in 2 ways, for example, as 1265625 + 19881 = 1125^2 + 141^2 .

It is an Ulam number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1285506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1795 + ... + 2406.

2^1285506 is an apocalyptic number.

1285506 is an abundant number, since it is smaller than the sum of its proper divisors (1664298).

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

1285506 is a wasteful number, since it uses less digits than its factorization.

1285506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226 (or 4223 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1285506 is about 1133.8015699407. The cubic root of 1285506 is about 108.7321651292.

The spelling of 1285506 in words is "one million, two hundred eighty-five thousand, five hundred six".