1668879 has 12 divisors (see below), whose sum is σ = 2434536. Its totient is φ = 1101552.

The previous prime is 1668869. The next prime is 1668883. The reversal of 1668879 is 9788661.

It is a happy number.

It is not a de Polignac number, because 1668879 - 2⁵ = 1668847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668869) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 97 + ... + 1829.

It is an arithmetic number, because the mean of its divisors is an integer number (202878).

2^1668879 is an apocalyptic number.

1668879 is a deficient number, since it is larger than the sum of its proper divisors (765657).

1668879 is a wasteful number, since it uses less digits than its factorization.

1668879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846 (or 1843 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1668879 is about 1291.8509976000. The cubic root of 1668879 is about 118.6155471790.

It can be divided in two parts, 166 and 8879, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 1668879 in words is "one million, six hundred sixty-eight thousand, eight hundred seventy-nine".