420779 has 2 divisors, whose sum is σ = 420780. Its totient is φ = 420778.

The previous prime is 420769. The next prime is 420781. The reversal of 420779 is 977024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420779 is a prime.

It is a Sophie Germain prime.

Together with 420781, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420779.

It is not a weakly prime, because it can be changed into another prime (420769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210389 + 210390.

It is an arithmetic number, because the mean of its divisors is an integer number (210390).

2⁴²⁰⁷⁷⁹ is an apocalyptic number.

420779 is a deficient number, since it is larger than the sum of its proper divisors (1).

420779 is an equidigital number, since it uses as much as digits as its factorization.

420779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 420779 is about 648.6748029637. The cubic root of 420779 is about 74.9349955270.

The spelling of 420779 in words is "four hundred twenty thousand, seven hundred seventy-nine".