1659906 has 32 divisors (see below), whose sum is σ = 3758400. Its totient is φ = 542880.

The previous prime is 1659893. The next prime is 1659913. The reversal of 1659906 is 6099561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2926 + ... + 3446.

It is an arithmetic number, because the mean of its divisors is an integer number (117450).

2^1659906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1879200).

1659906 is an abundant number, since it is smaller than the sum of its proper divisors (2098494).

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

1659906 is a wasteful number, since it uses less digits than its factorization.

1659906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 1659906 is about 1288.3733930814. The cubic root of 1659906 is about 118.4025797618.

The spelling of 1659906 in words is "one million, six hundred fifty-nine thousand, nine hundred six".