1881668 has 6 divisors (see below), whose sum is σ = 3292926. Its totient is φ = 940832.

The previous prime is 1881641. The next prime is 1881697. The reversal of 1881668 is 8661881.

It can be written as a sum of positive squares in only one way, i.e., 1643524 + 238144 = 1282^2 + 488^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 235205 + ... + 235212.

It is an arithmetic number, because the mean of its divisors is an integer number (548821).

2^1881668 is an apocalyptic number.

It is an amenable number.

1881668 is a deficient number, since it is larger than the sum of its proper divisors (1411258).

1881668 is a wasteful number, since it uses less digits than its factorization.

1881668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470421 (or 470419 counting only the distinct ones).

The product of its digits is 18432, while the sum is 38.

The square root of 1881668 is about 1371.7390422380. The cubic root of 1881668 is about 123.4566059087.

The spelling of 1881668 in words is "one million, eight hundred eighty-one thousand, six hundred sixty-eight".