421987398 has 16 divisors (see below), whose sum is σ = 964542720. Its totient is φ = 120567816.

The previous prime is 421987301. The next prime is 421987399. The reversal of 421987398 is 893789124.

It is a self number, because there is not a number n which added to its sum of digits gives 421987398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421987399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5023618 + ... + 5023701.

It is an arithmetic number, because the mean of its divisors is an integer number (60283920).

Almost surely, 2^421987398 is an apocalyptic number.

421987398 is an abundant number, since it is smaller than the sum of its proper divisors (542555322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421987398 is a wasteful number, since it uses less digits than its factorization.

421987398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10047331.

The product of its digits is 870912, while the sum is 51.

The square root of 421987398 is about 20542.3318540033. The cubic root of 421987398 is about 750.0666003079.

The spelling of 421987398 in words is "four hundred twenty-one million, nine hundred eighty-seven thousand, three hundred ninety-eight".