421954787 has 2 divisors, whose sum is σ = 421954788. Its totient is φ = 421954786.

The previous prime is 421954777. The next prime is 421954801. The reversal of 421954787 is 787459124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421954787 - 2⁸ = 421954531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421954747) 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, 210977393 + 210977394.

It is an arithmetic number, because the mean of its divisors is an integer number (210977394).

Almost surely, 2^421954787 is an apocalyptic number.

421954787 is a deficient number, since it is larger than the sum of its proper divisors (1).

421954787 is an equidigital number, since it uses as much as digits as its factorization.

421954787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 47.

The square root of 421954787 is about 20541.5380874948. The cubic root of 421954787 is about 750.0472782048.

The spelling of 421954787 in words is "four hundred twenty-one million, nine hundred fifty-four thousand, seven hundred eighty-seven".