420383993 has 2 divisors, whose sum is σ = 420383994. Its totient is φ = 420383992.

The previous prime is 420383989. The next prime is 420384011. The reversal of 420383993 is 399383024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235070224 + 185313769 = 15332^2 + 13613^2 .

It is a cyclic number.

It is not a de Polignac number, because 420383993 - 2² = 420383989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420383993.

It is not a weakly prime, because it can be changed into another prime (420383983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210191996 + 210191997.

It is an arithmetic number, because the mean of its divisors is an integer number (210191997).

Almost surely, 2^420383993 is an apocalyptic number.

It is an amenable number.

420383993 is a deficient number, since it is larger than the sum of its proper divisors (1).

420383993 is an equidigital number, since it uses as much as digits as its factorization.

420383993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 420383993 is about 20503.2678614898. The cubic root of 420383993 is about 749.1153973440.

The spelling of 420383993 in words is "four hundred twenty million, three hundred eighty-three thousand, nine hundred ninety-three".