2109979 has 2 divisors, whose sum is σ = 2109980. Its totient is φ = 2109978.

The previous prime is 2109973. The next prime is 2110001. The reversal of 2109979 is 9799012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2109979 is a prime.

It is a super-2 number, since 2×2109979² = 8904022760882, which contains 22 as substring.

It is a Chen prime.

2109979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2109973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054989 + 1054990.

It is an arithmetic number, because the mean of its divisors is an integer number (1054990).

2^2109979 is an apocalyptic number.

2109979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109979 is an equidigital number, since it uses as much as digits as its factorization.

2109979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 2109979 is about 1452.5766761173. The cubic root of 2109979 is about 128.2604357271.

The spelling of 2109979 in words is "two million, one hundred nine thousand, nine hundred seventy-nine".