8172979 has 2 divisors, whose sum is σ = 8172980. Its totient is φ = 8172978.

The previous prime is 8172973. The next prime is 8172991. The reversal of 8172979 is 9792718.

It is a happy number.

8172979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8172979 - 2⁹ = 8172467 is a prime.

8172979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8172973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086489 + 4086490.

It is an arithmetic number, because the mean of its divisors is an integer number (4086490).

Almost surely, 2^8172979 is an apocalyptic number.

8172979 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172979 is an equidigital number, since it uses as much as digits as its factorization.

8172979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 8172979 is about 2858.8422481837. The cubic root of 8172979 is about 201.4312252076.

The spelling of 8172979 in words is "eight million, one hundred seventy-two thousand, nine hundred seventy-nine".