421645432 has 16 divisors (see below), whose sum is σ = 851399640. Its totient is φ = 194605536.

The previous prime is 421645417. The next prime is 421645493. The reversal of 421645432 is 234546124.

It is a junction number, because it is equal to n+sod(n) for n = 421645394 and 421645403.

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 3 ways as a sum of consecutive naturals, for example, 2027038 + ... + 2027245.

Almost surely, 2^421645432 is an apocalyptic number.

It is an amenable number.

421645432 is an abundant number, since it is smaller than the sum of its proper divisors (429754208).

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

421645432 is a wasteful number, since it uses less digits than its factorization.

421645432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054302 (or 4054298 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 421645432 is about 20534.0067205599. The cubic root of 421645432 is about 749.8639350203.

The spelling of 421645432 in words is "four hundred twenty-one million, six hundred forty-five thousand, four hundred thirty-two".