1905666 has 48 divisors (see below), whose sum is σ = 4656576. Its totient is φ = 509184.

The previous prime is 1905661. The next prime is 1905667. The reversal of 1905666 is 6665091.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1905661) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 12060 + ... + 12216.

It is an arithmetic number, because the mean of its divisors is an integer number (97012).

2^1905666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1905666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328288).

1905666 is an abundant number, since it is smaller than the sum of its proper divisors (2750910).

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

1905666 is a wasteful number, since it uses less digits than its factorization.

1905666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 1905666 is about 1380.4586194450. The cubic root of 1905666 is about 123.9792282237.

The spelling of 1905666 in words is "one million, nine hundred five thousand, six hundred sixty-six".