421826687 has 2 divisors, whose sum is σ = 421826688. Its totient is φ = 421826686.

The previous prime is 421826659. The next prime is 421826719. The reversal of 421826687 is 786628124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421826687 - 2²⁶ = 354717823 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 (421826617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210913343 + 210913344.

It is an arithmetic number, because the mean of its divisors is an integer number (210913344).

Almost surely, 2^421826687 is an apocalyptic number.

421826687 is a deficient number, since it is larger than the sum of its proper divisors (1).

421826687 is an equidigital number, since it uses as much as digits as its factorization.

421826687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 44.

The square root of 421826687 is about 20538.4197785516. The cubic root of 421826687 is about 749.9713689811.

The spelling of 421826687 in words is "four hundred twenty-one million, eight hundred twenty-six thousand, six hundred eighty-seven".