421555424 has 48 divisors (see below), whose sum is σ = 846227088. Its totient is φ = 206671872.

The previous prime is 421555417. The next prime is 421555441. The reversal of 421555424 is 424555124.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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, 756554 + ... + 757110.

It is an arithmetic number, because the mean of its divisors is an integer number (17629731).

Almost surely, 2^421555424 is an apocalyptic number.

It is an amenable number.

421555424 is an abundant number, since it is smaller than the sum of its proper divisors (424671664).

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

421555424 is a wasteful number, since it uses less digits than its factorization.

421555424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987 (or 979 counting only the distinct ones).

The product of its digits is 32000, while the sum is 32.

The square root of 421555424 is about 20531.8149222128. The cubic root of 421555424 is about 749.8105737906.

The spelling of 421555424 in words is "four hundred twenty-one million, five hundred fifty-five thousand, four hundred twenty-four".