1668979 has 16 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 1403136.

The previous prime is 1668971. The next prime is 1668983. The reversal of 1668979 is 9798661.

It is not a de Polignac number, because 1668979 - 2³ = 1668971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7047 + ... + 7279.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2^1668979 is an apocalyptic number.

1668979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1668979 is a deficient number, since it is larger than the sum of its proper divisors (296621).

1668979 is a wasteful number, since it uses less digits than its factorization.

1668979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294.

The product of its digits is 163296, while the sum is 46.

The square root of 1668979 is about 1291.8897011742. The cubic root of 1668979 is about 118.6179162978.

The spelling of 1668979 in words is "one million, six hundred sixty-eight thousand, nine hundred seventy-nine".