420400067 has 2 divisors, whose sum is σ = 420400068. Its totient is φ = 420400066.

The previous prime is 420399997. The next prime is 420400087. The reversal of 420400067 is 760004024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420400067 - 2¹² = 420395971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420400087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210200033 + 210200034.

It is an arithmetic number, because the mean of its divisors is an integer number (210200034).

Almost surely, 2^420400067 is an apocalyptic number.

420400067 is a deficient number, since it is larger than the sum of its proper divisors (1).

420400067 is an equidigital number, since it uses as much as digits as its factorization.

420400067 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 420400067 is about 20503.6598440376. The cubic root of 420400067 is about 749.1249450652.

The spelling of 420400067 in words is "four hundred twenty million, four hundred thousand, sixty-seven".