1285606 has 16 divisors (see below), whose sum is σ = 2219040. Its totient is φ = 547200.

The previous prime is 1285553. The next prime is 1285607. The reversal of 1285606 is 6065821.

1285606 is a nontrivial binomial coefficient, being equal to C(1604, 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3006 + ... + 3406.

It is an arithmetic number, because the mean of its divisors is an integer number (138690).

2^1285606 is an apocalyptic number.

1285606 is the 1603-rd triangular number and also the 802-nd hexagonal number.

1285606 is the 535-th centered nonagonal number.

1285606 is a deficient number, since it is larger than the sum of its proper divisors (933434).

1285606 is a wasteful number, since it uses less digits than its factorization.

1285606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1285606 is about 1133.8456685105. The cubic root of 1285606 is about 108.7349844949.

It can be divided in two parts, 1285 and 606, that added together give a triangular number (1891 = T₆₁).

The spelling of 1285606 in words is "one million, two hundred eighty-five thousand, six hundred six".