421908593 has 2 divisors, whose sum is σ = 421908594. Its totient is φ = 421908592.

The previous prime is 421908577. The next prime is 421908607. The reversal of 421908593 is 395809124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227919409 + 193989184 = 15097^2 + 13928^2 .

It is a cyclic number.

It is not a de Polignac number, because 421908593 - 2⁴ = 421908577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421908593.

It is not a weakly prime, because it can be changed into another prime (421908503) 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, 210954296 + 210954297.

It is an arithmetic number, because the mean of its divisors is an integer number (210954297).

Almost surely, 2^421908593 is an apocalyptic number.

It is an amenable number.

421908593 is a deficient number, since it is larger than the sum of its proper divisors (1).

421908593 is an equidigital number, since it uses as much as digits as its factorization.

421908593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 421908593 is about 20540.4136521152. The cubic root of 421908593 is about 750.0199064346.

The spelling of 421908593 in words is "four hundred twenty-one million, nine hundred eight thousand, five hundred ninety-three".