421000687 has 2 divisors, whose sum is σ = 421000688. Its totient is φ = 421000686.

The previous prime is 421000649. The next prime is 421000691. The reversal of 421000687 is 786000124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421000687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421000607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210500343 + 210500344.

It is an arithmetic number, because the mean of its divisors is an integer number (210500344).

Almost surely, 2^421000687 is an apocalyptic number.

421000687 is a deficient number, since it is larger than the sum of its proper divisors (1).

421000687 is an equidigital number, since it uses as much as digits as its factorization.

421000687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 421000687 is about 20518.3012698420. The cubic root of 421000687 is about 749.4815302607.

The spelling of 421000687 in words is "four hundred twenty-one million, six hundred eighty-seven", and thus it is an aban number.