420839829779 has 2 divisors, whose sum is σ = 420839829780. Its totient is φ = 420839829778.

The previous prime is 420839829703. The next prime is 420839829847. The reversal of 420839829779 is 977928938024.

It is an a-pointer prime, because the next prime (420839829847) can be obtained adding 420839829779 to its sum of digits (68).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420839829779 - 2²⁴ = 420823052563 is a prime.

It is not a weakly prime, because it can be changed into another prime (420839823779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210419914889 + 210419914890.

It is an arithmetic number, because the mean of its divisors is an integer number (210419914890).

Almost surely, 2^420839829779 is an apocalyptic number.

420839829779 is a deficient number, since it is larger than the sum of its proper divisors (1).

420839829779 is an equidigital number, since it uses as much as digits as its factorization.

420839829779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109734912, while the sum is 68.

The spelling of 420839829779 in words is "four hundred twenty billion, eight hundred thirty-nine million, eight hundred twenty-nine thousand, seven hundred seventy-nine".