421989287 has 2 divisors, whose sum is σ = 421989288. Its totient is φ = 421989286.

The previous prime is 421989263. The next prime is 421989301. The reversal of 421989287 is 782989124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421989287 - 2²⁰ = 420940711 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421989247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210994643 + 210994644.

It is an arithmetic number, because the mean of its divisors is an integer number (210994644).

Almost surely, 2^421989287 is an apocalyptic number.

421989287 is a deficient number, since it is larger than the sum of its proper divisors (1).

421989287 is an equidigital number, since it uses as much as digits as its factorization.

421989287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 421989287 is about 20542.3778321790. The cubic root of 421989287 is about 750.0677195149.

The spelling of 421989287 in words is "four hundred twenty-one million, nine hundred eighty-nine thousand, two hundred eighty-seven".