1285668 has 36 divisors (see below), whose sum is σ = 3302208. Its totient is φ = 421680.

The previous prime is 1285649. The next prime is 1285679. The reversal of 1285668 is 8665821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 2305 + ... + 2807.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

2^1285668 is an apocalyptic number.

1285668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651104).

1285668 is an abundant number, since it is smaller than the sum of its proper divisors (2016540).

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

1285668 is a wasteful number, since it uses less digits than its factorization.

1285668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 579 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1285668 is about 1133.8730087624. The cubic root of 1285668 is about 108.7367324282.

It can be divided in two parts, 1285 and 668, that added together give a triangular number (1953 = T₆₂).

The spelling of 1285668 in words is "one million, two hundred eighty-five thousand, six hundred sixty-eight".