421917983 has 2 divisors, whose sum is σ = 421917984. Its totient is φ = 421917982.

The previous prime is 421917943. The next prime is 421918043. The reversal of 421917983 is 389719124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421917983 - 2²² = 417723679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421917943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210958991 + 210958992.

It is an arithmetic number, because the mean of its divisors is an integer number (210958992).

Almost surely, 2^421917983 is an apocalyptic number.

421917983 is a deficient number, since it is larger than the sum of its proper divisors (1).

421917983 is an equidigital number, since it uses as much as digits as its factorization.

421917983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 421917983 is about 20540.6422246238. The cubic root of 421917983 is about 750.0254705424.

The spelling of 421917983 in words is "four hundred twenty-one million, nine hundred seventeen thousand, nine hundred eighty-three".