421190779 has 2 divisors, whose sum is σ = 421190780. Its totient is φ = 421190778.

The previous prime is 421190773. The next prime is 421190797. The reversal of 421190779 is 977091124.

Together with next prime (421190797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421190779 - 2³ = 421190771 is a prime.

It is not a weakly prime, because it can be changed into another prime (421190771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210595389 + 210595390.

It is an arithmetic number, because the mean of its divisors is an integer number (210595390).

Almost surely, 2^421190779 is an apocalyptic number.

421190779 is a deficient number, since it is larger than the sum of its proper divisors (1).

421190779 is an equidigital number, since it uses as much as digits as its factorization.

421190779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 421190779 is about 20522.9330018884. The cubic root of 421190779 is about 749.5943163043.

The spelling of 421190779 in words is "four hundred twenty-one million, one hundred ninety thousand, seven hundred seventy-nine".