2172979 has 2 divisors, whose sum is σ = 2172980. Its totient is φ = 2172978.

The previous prime is 2172977. The next prime is 2172983. The reversal of 2172979 is 9792712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2172979 - 2¹ = 2172977 is a prime.

Together with 2172977, it forms a pair of twin primes.

2172979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2172977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086489 + 1086490.

It is an arithmetic number, because the mean of its divisors is an integer number (1086490).

2^2172979 is an apocalyptic number.

2172979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172979 is an equidigital number, since it uses as much as digits as its factorization.

2172979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 37.

The square root of 2172979 is about 1474.1027779636. The cubic root of 2172979 is about 129.5244757283.

The spelling of 2172979 in words is "two million, one hundred seventy-two thousand, nine hundred seventy-nine".