420209393 has 2 divisors, whose sum is σ = 420209394. Its totient is φ = 420209392.

The previous prime is 420209351. The next prime is 420209399. The reversal of 420209393 is 393902024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412211809 + 7997584 = 20303^2 + 2828^2 .

It is a cyclic number.

It is not a de Polignac number, because 420209393 - 2¹⁴ = 420193009 is a prime.

It is not a weakly prime, because it can be changed into another prime (420209399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210104696 + 210104697.

It is an arithmetic number, because the mean of its divisors is an integer number (210104697).

Almost surely, 2^420209393 is an apocalyptic number.

It is an amenable number.

420209393 is a deficient number, since it is larger than the sum of its proper divisors (1).

420209393 is an equidigital number, since it uses as much as digits as its factorization.

420209393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 420209393 is about 20499.0095614398. The cubic root of 420209393 is about 749.0116718116.

The spelling of 420209393 in words is "four hundred twenty million, two hundred nine thousand, three hundred ninety-three".