421456987 has 6 divisors (see below), whose sum is σ = 490266348. Its totient is φ = 361248804.

The previous prime is 421456969. The next prime is 421457009. The reversal of 421456987 is 789654124.

It is not a de Polignac number, because 421456987 - 2¹⁵ = 421424219 is a prime.

It is a super-2 number, since 2×421456987² = 355251983782236338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421456907) 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 in 5 ways as a sum of consecutive naturals, for example, 4300533 + ... + 4300630.

It is an arithmetic number, because the mean of its divisors is an integer number (81711058).

Almost surely, 2^421456987 is an apocalyptic number.

421456987 is a deficient number, since it is larger than the sum of its proper divisors (68809361).

421456987 is an equidigital number, since it uses as much as digits as its factorization.

421456987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8601177 (or 8601170 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 421456987 is about 20529.4176001172. The cubic root of 421456987 is about 749.7522067329.

The spelling of 421456987 in words is "four hundred twenty-one million, four hundred fifty-six thousand, nine hundred eighty-seven".