1905668 has 24 divisors (see below), whose sum is σ = 3470040. Its totient is φ = 915200.

The previous prime is 1905667. The next prime is 1905671. The reversal of 1905668 is 8665091.

It can be written as a sum of positive squares in 4 ways, for example, as 669124 + 1236544 = 818^2 + 1112^2 .

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 7 ways as a sum of consecutive naturals, for example, 18818 + ... + 18918.

It is an arithmetic number, because the mean of its divisors is an integer number (144585).

2^1905668 is an apocalyptic number.

It is an amenable number.

1905668 is a deficient number, since it is larger than the sum of its proper divisors (1564372).

1905668 is a wasteful number, since it uses less digits than its factorization.

1905668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1905668 is about 1380.4593438418. The cubic root of 1905668 is about 123.9792715958.

The spelling of 1905668 in words is "one million, nine hundred five thousand, six hundred sixty-eight".