1666879 has 8 divisors (see below), whose sum is σ = 1755360. Its totient is φ = 1582768.

The previous prime is 1666871. The next prime is 1666897. The reversal of 1666879 is 9786661.

It is not a de Polignac number, because 1666879 - 2³ = 1666871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12099 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (219420).

2^1666879 is an apocalyptic number.

1666879 is a deficient number, since it is larger than the sum of its proper divisors (88481).

1666879 is an frugal number, since it uses more digits than its factorization.

1666879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 160 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 1666879 is about 1291.0766824631. The cubic root of 1666879 is about 118.5681449159.

The spelling of 1666879 in words is "one million, six hundred sixty-six thousand, eight hundred seventy-nine".