1906686 has 64 divisors (see below), whose sum is σ = 4700160. Its totient is φ = 570240.

The previous prime is 1906673. The next prime is 1906691. The reversal of 1906686 is 6866091.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1906686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28425 + ... + 28491.

It is an arithmetic number, because the mean of its divisors is an integer number (73440).

2^1906686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1906686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2350080).

1906686 is an abundant number, since it is smaller than the sum of its proper divisors (2793474).

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

1906686 is a wasteful number, since it uses less digits than its factorization.

1906686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1906686 is about 1380.8280124621. The cubic root of 1906686 is about 124.0013440715.

The spelling of 1906686 in words is "one million, nine hundred six thousand, six hundred eighty-six".