420129947 has 2 divisors, whose sum is σ = 420129948. Its totient is φ = 420129946.

The previous prime is 420129901. The next prime is 420129953. The reversal of 420129947 is 749921024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420129947 - 2¹⁸ = 419867803 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420129947.

It is not a weakly prime, because it can be changed into another prime (420129967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210064973 + 210064974.

It is an arithmetic number, because the mean of its divisors is an integer number (210064974).

Almost surely, 2^420129947 is an apocalyptic number.

420129947 is a deficient number, since it is larger than the sum of its proper divisors (1).

420129947 is an equidigital number, since it uses as much as digits as its factorization.

420129947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 420129947 is about 20497.0716688994. The cubic root of 420129947 is about 748.9644654007.

The spelling of 420129947 in words is "four hundred twenty million, one hundred twenty-nine thousand, nine hundred forty-seven".