1906668 has 18 divisors (see below), whose sum is σ = 4819724. Its totient is φ = 635544.

The previous prime is 1906643. The next prime is 1906673. The reversal of 1906668 is 8666091.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 52963 = 1906668 / (1 + 9 + 0 + 6 + 6 + 6 + 8).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 26446 + ... + 26517.

2^1906668 is an apocalyptic number.

1906668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1906668 is an abundant number, since it is smaller than the sum of its proper divisors (2913056).

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

1906668 is a wasteful number, since it uses less digits than its factorization.

1906668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52973 (or 52968 counting only the distinct ones).

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

The square root of 1906668 is about 1380.8214946183. The cubic root of 1906668 is about 124.0009538602. Note that the first 3 decimals are identical.

The spelling of 1906668 in words is "one million, nine hundred six thousand, six hundred sixty-eight".