409779079 has 2 divisors, whose sum is σ = 409779080. Its totient is φ = 409779078.

The previous prime is 409779043. The next prime is 409779143. The reversal of 409779079 is 970977904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409779079 - 2¹¹ = 409777031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409779179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204889539 + 204889540.

It is an arithmetic number, because the mean of its divisors is an integer number (204889540).

Almost surely, 2^409779079 is an apocalyptic number.

409779079 is a deficient number, since it is larger than the sum of its proper divisors (1).

409779079 is an equidigital number, since it uses as much as digits as its factorization.

409779079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000188, while the sum is 52.

The square root of 409779079 is about 20243.0007409969. Note that the first 3 decimals coincide. The cubic root of 409779079 is about 742.7624282192.

The spelling of 409779079 in words is "four hundred nine million, seven hundred seventy-nine thousand, seventy-nine".