420031247 has 2 divisors, whose sum is σ = 420031248. Its totient is φ = 420031246.

The previous prime is 420031231. The next prime is 420031259. The reversal of 420031247 is 742130024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420031247 - 2⁴ = 420031231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420034247) 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, 210015623 + 210015624.

It is an arithmetic number, because the mean of its divisors is an integer number (210015624).

Almost surely, 2^420031247 is an apocalyptic number.

420031247 is a deficient number, since it is larger than the sum of its proper divisors (1).

420031247 is an equidigital number, since it uses as much as digits as its factorization.

420031247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 420031247 is about 20494.6638664800. The cubic root of 420031247 is about 748.9058100705.

The spelling of 420031247 in words is "four hundred twenty million, thirty-one thousand, two hundred forty-seven".