421532644 has 72 divisors (see below), whose sum is σ = 834146208. Its totient is φ = 186151680.

The previous prime is 421532627. The next prime is 421532653. The reversal of 421532644 is 446235124.

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 23 ways as a sum of consecutive naturals, for example, 1856859 + ... + 1857085.

It is an arithmetic number, because the mean of its divisors is an integer number (11585364).

Almost surely, 2^421532644 is an apocalyptic number.

It is an amenable number.

421532644 is a deficient number, since it is larger than the sum of its proper divisors (412613564).

421532644 is a wasteful number, since it uses less digits than its factorization.

421532644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 350 counting only the distinct ones).

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

The square root of 421532644 is about 20531.2601659031. The cubic root of 421532644 is about 749.7970674665.

Adding to 421532644 its reverse (446235124), we get a palindrome (867767768).

The spelling of 421532644 in words is "four hundred twenty-one million, five hundred thirty-two thousand, six hundred forty-four".