421006889 has 2 divisors, whose sum is σ = 421006890. Its totient is φ = 421006888.

The previous prime is 421006849. The next prime is 421006907. The reversal of 421006889 is 988600124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363550489 + 57456400 = 19067^2 + 7580^2 .

It is a cyclic number.

It is not a de Polignac number, because 421006889 - 2¹² = 421002793 is a prime.

It is not a weakly prime, because it can be changed into another prime (421006849) 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, 210503444 + 210503445.

It is an arithmetic number, because the mean of its divisors is an integer number (210503445).

Almost surely, 2^421006889 is an apocalyptic number.

It is an amenable number.

421006889 is a deficient number, since it is larger than the sum of its proper divisors (1).

421006889 is an equidigital number, since it uses as much as digits as its factorization.

421006889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 421006889 is about 20518.4524026545. The cubic root of 421006889 is about 749.4852105885.

The spelling of 421006889 in words is "four hundred twenty-one million, six thousand, eight hundred eighty-nine".