420243547 has 2 divisors, whose sum is σ = 420243548. Its totient is φ = 420243546.

The previous prime is 420243517. The next prime is 420243569. The reversal of 420243547 is 745342024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420243547 is a prime.

It is not a weakly prime, because it can be changed into another prime (420243517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210121773 + 210121774.

It is an arithmetic number, because the mean of its divisors is an integer number (210121774).

Almost surely, 2^420243547 is an apocalyptic number.

420243547 is a deficient number, since it is larger than the sum of its proper divisors (1).

420243547 is an equidigital number, since it uses as much as digits as its factorization.

420243547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 31.

The square root of 420243547 is about 20499.8426091519. The cubic root of 420243547 is about 749.0319641166.

The spelling of 420243547 in words is "four hundred twenty million, two hundred forty-three thousand, five hundred forty-seven".