1878664 has 8 divisors (see below), whose sum is σ = 3522510. Its totient is φ = 939328.

The previous prime is 1878659. The next prime is 1878677. The reversal of 1878664 is 4668781.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 1764 = 1370^2 + 42^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117409 + ... + 117424.

2^1878664 is an apocalyptic number.

It is an amenable number.

1878664 is a deficient number, since it is larger than the sum of its proper divisors (1643846).

1878664 is a wasteful number, since it uses less digits than its factorization.

1878664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234839 (or 234835 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 1878664 is about 1370.6436444240. The cubic root of 1878664 is about 123.3908732404.

The spelling of 1878664 in words is "one million, eight hundred seventy-eight thousand, six hundred sixty-four".