420833779 has 2 divisors, whose sum is σ = 420833780. Its totient is φ = 420833778.

The previous prime is 420833729. The next prime is 420833797. The reversal of 420833779 is 977338024.

Together with next prime (420833797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420833779 - 2⁹ = 420833267 is a prime.

It is not a weakly prime, because it can be changed into another prime (420833719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210416889 + 210416890.

It is an arithmetic number, because the mean of its divisors is an integer number (210416890).

Almost surely, 2^420833779 is an apocalyptic number.

420833779 is a deficient number, since it is larger than the sum of its proper divisors (1).

420833779 is an equidigital number, since it uses as much as digits as its factorization.

420833779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 420833779 is about 20514.2335708649. The cubic root of 420833779 is about 749.3824718330.

The spelling of 420833779 in words is "four hundred twenty million, eight hundred thirty-three thousand, seven hundred seventy-nine".