419779309 has 2 divisors, whose sum is σ = 419779310. Its totient is φ = 419779308.

The previous prime is 419779307. The next prime is 419779357. The reversal of 419779309 is 903977914.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416282409 + 3496900 = 20403^2 + 1870^2 .

It is a cyclic number.

It is not a de Polignac number, because 419779309 - 2¹ = 419779307 is a prime.

Together with 419779307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (419779301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209889654 + 209889655.

It is an arithmetic number, because the mean of its divisors is an integer number (209889655).

Almost surely, 2^419779309 is an apocalyptic number.

It is an amenable number.

419779309 is a deficient number, since it is larger than the sum of its proper divisors (1).

419779309 is an equidigital number, since it uses as much as digits as its factorization.

419779309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 419779309 is about 20488.5165153556. The cubic root of 419779309 is about 748.7560469521.

The spelling of 419779309 in words is "four hundred nineteen million, seven hundred seventy-nine thousand, three hundred nine".