79940197 has 2 divisors, whose sum is σ = 79940198. Its totient is φ = 79940196.

The previous prime is 79940177. The next prime is 79940207. The reversal of 79940197 is 79104997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43046721 + 36893476 = 6561^2 + 6074^2 .

It is a cyclic number.

It is not a de Polignac number, because 79940197 - 2¹⁹ = 79415909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79940117) 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 as a sum of consecutive naturals, namely, 39970098 + 39970099.

It is an arithmetic number, because the mean of its divisors is an integer number (39970099).

Almost surely, 2^79940197 is an apocalyptic number.

It is an amenable number.

79940197 is a deficient number, since it is larger than the sum of its proper divisors (1).

79940197 is an equidigital number, since it uses as much as digits as its factorization.

79940197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 79940197 is about 8940.9281956629. The cubic root of 79940197 is about 430.7795431932.

The spelling of 79940197 in words is "seventy-nine million, nine hundred forty thousand, one hundred ninety-seven".