421788047 has 2 divisors, whose sum is σ = 421788048. Its totient is φ = 421788046.

The previous prime is 421787983. The next prime is 421788079. The reversal of 421788047 is 740887124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421788047 - 2⁶ = 421787983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421787995 and 421788013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421788097) 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, 210894023 + 210894024.

It is an arithmetic number, because the mean of its divisors is an integer number (210894024).

Almost surely, 2^421788047 is an apocalyptic number.

421788047 is a deficient number, since it is larger than the sum of its proper divisors (1).

421788047 is an equidigital number, since it uses as much as digits as its factorization.

421788047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100352, while the sum is 41.

The square root of 421788047 is about 20537.4790809388. The cubic root of 421788047 is about 749.9484687558.

The spelling of 421788047 in words is "four hundred twenty-one million, seven hundred eighty-eight thousand, forty-seven".