420145477 has 2 divisors, whose sum is σ = 420145478. Its totient is φ = 420145476.

The previous prime is 420145421. The next prime is 420145487. The reversal of 420145477 is 774541024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392277636 + 27867841 = 19806^2 + 5279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420145477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420145487) 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, 210072738 + 210072739.

It is an arithmetic number, because the mean of its divisors is an integer number (210072739).

Almost surely, 2^420145477 is an apocalyptic number.

It is an amenable number.

420145477 is a deficient number, since it is larger than the sum of its proper divisors (1).

420145477 is an equidigital number, since it uses as much as digits as its factorization.

420145477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 34.

The square root of 420145477 is about 20497.4505000012. The cubic root of 420145477 is about 748.9736937160.

The spelling of 420145477 in words is "four hundred twenty million, one hundred forty-five thousand, four hundred seventy-seven".