420001187 has 2 divisors, whose sum is σ = 420001188. Its totient is φ = 420001186.

The previous prime is 420001177. The next prime is 420001189. The reversal of 420001187 is 781100024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420001187 - 2⁶ = 420001123 is a prime.

Together with 420001189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420001189) 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, 210000593 + 210000594.

It is an arithmetic number, because the mean of its divisors is an integer number (210000594).

Almost surely, 2^420001187 is an apocalyptic number.

420001187 is a deficient number, since it is larger than the sum of its proper divisors (1).

420001187 is an equidigital number, since it uses as much as digits as its factorization.

420001187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 420001187 is about 20493.9304917334. The cubic root of 420001187 is about 748.8879442205.

The spelling of 420001187 in words is "four hundred twenty million, one thousand, one hundred eighty-seven".