421197687 has 12 divisors (see below), whose sum is σ = 608760360. Its totient is φ = 280630608.

The previous prime is 421197683. The next prime is 421197811. The reversal of 421197687 is 786791124.

It is a happy number.

It is not a de Polignac number, because 421197687 - 2² = 421197683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421197683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2989 + ... + 29177.

It is an arithmetic number, because the mean of its divisors is an integer number (50730030).

Almost surely, 2^421197687 is an apocalyptic number.

421197687 is a deficient number, since it is larger than the sum of its proper divisors (187562673).

421197687 is a wasteful number, since it uses less digits than its factorization.

421197687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27982 (or 27979 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 421197687 is about 20523.1013007294. The cubic root of 421197687 is about 749.5984143437.

The spelling of 421197687 in words is "four hundred twenty-one million, one hundred ninety-seven thousand, six hundred eighty-seven".