421648393 has 2 divisors, whose sum is σ = 421648394. Its totient is φ = 421648392.

The previous prime is 421648349. The next prime is 421648417. The reversal of 421648393 is 393846124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315311049 + 106337344 = 17757^2 + 10312^2 .

It is a cyclic number.

It is not a de Polignac number, because 421648393 - 2¹³ = 421640201 is a prime.

It is not a weakly prime, because it can be changed into another prime (421648333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210824196 + 210824197.

It is an arithmetic number, because the mean of its divisors is an integer number (210824197).

Almost surely, 2^421648393 is an apocalyptic number.

It is an amenable number.

421648393 is a deficient number, since it is larger than the sum of its proper divisors (1).

421648393 is an equidigital number, since it uses as much as digits as its factorization.

421648393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 421648393 is about 20534.0788203416. The cubic root of 421648393 is about 749.8656903197.

The spelling of 421648393 in words is "four hundred twenty-one million, six hundred forty-eight thousand, three hundred ninety-three".