421553998 has 32 divisors (see below), whose sum is σ = 687149568. Its totient is φ = 193200000.

The previous prime is 421553989. The next prime is 421554011. The reversal of 421553998 is 899355124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400573 + ... + 401623.

It is an arithmetic number, because the mean of its divisors is an integer number (21473424).

Almost surely, 2^421553998 is an apocalyptic number.

421553998 is a deficient number, since it is larger than the sum of its proper divisors (265595570).

421553998 is a wasteful number, since it uses less digits than its factorization.

421553998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its digits is 388800, while the sum is 46.

The square root of 421553998 is about 20531.7801955895. The cubic root of 421553998 is about 749.8097283256.

The spelling of 421553998 in words is "four hundred twenty-one million, five hundred fifty-three thousand, nine hundred ninety-eight".