421641520 has 40 divisors (see below), whose sum is σ = 1022943456. Its totient is φ = 161323008.

The previous prime is 421641457. The next prime is 421641547. The reversal of 421641520 is 25146124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 112737 + ... + 116416.

Almost surely, 2^421641520 is an apocalyptic number.

421641520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421641520 is an abundant number, since it is smaller than the sum of its proper divisors (601301936).

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

421641520 is a wasteful number, since it uses less digits than its factorization.

421641520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229189 (or 229183 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 421641520 is about 20533.9114637226. The cubic root of 421641520 is about 749.8616159495.

Adding to 421641520 its reverse (25146124), we get a palindrome (446787644).

The spelling of 421641520 in words is "four hundred twenty-one million, six hundred forty-one thousand, five hundred twenty".