420005437 has 2 divisors, whose sum is σ = 420005438. Its totient is φ = 420005436.

The previous prime is 420005423. The next prime is 420005447. The reversal of 420005437 is 734500024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413146276 + 6859161 = 20326^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 420005437 - 2¹⁵ = 419972669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420005407) 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, 210002718 + 210002719.

It is an arithmetic number, because the mean of its divisors is an integer number (210002719).

Almost surely, 2^420005437 is an apocalyptic number.

It is an amenable number.

420005437 is a deficient number, since it is larger than the sum of its proper divisors (1).

420005437 is an equidigital number, since it uses as much as digits as its factorization.

420005437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 420005437 is about 20494.0341807073. The cubic root of 420005437 is about 748.8904702158.

The spelling of 420005437 in words is "four hundred twenty million, five thousand, four hundred thirty-seven".