420440047 has 2 divisors, whose sum is σ = 420440048. Its totient is φ = 420440046.

The previous prime is 420440003. The next prime is 420440089. The reversal of 420440047 is 740044024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420440047 - 2¹⁵ = 420407279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420440947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210220023 + 210220024.

It is an arithmetic number, because the mean of its divisors is an integer number (210220024).

Almost surely, 2^420440047 is an apocalyptic number.

420440047 is a deficient number, since it is larger than the sum of its proper divisors (1).

420440047 is an equidigital number, since it uses as much as digits as its factorization.

420440047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 420440047 is about 20504.6347687541. The cubic root of 420440047 is about 749.1486915456.

The spelling of 420440047 in words is "four hundred twenty million, four hundred forty thousand, forty-seven".