420444247 has 2 divisors, whose sum is σ = 420444248. Its totient is φ = 420444246.

The previous prime is 420444223. The next prime is 420444251. The reversal of 420444247 is 742444024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420444247 - 2¹¹ = 420442199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420444257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210222123 + 210222124.

It is an arithmetic number, because the mean of its divisors is an integer number (210222124).

Almost surely, 2^420444247 is an apocalyptic number.

420444247 is a deficient number, since it is larger than the sum of its proper divisors (1).

420444247 is an equidigital number, since it uses as much as digits as its factorization.

420444247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 31.

The square root of 420444247 is about 20504.7371843679. The cubic root of 420444247 is about 749.1511860860.

The spelling of 420444247 in words is "four hundred twenty million, four hundred forty-four thousand, two hundred forty-seven".