420721832 has 16 divisors (see below), whose sum is σ = 814300800. Its totient is φ = 203574960.

The previous prime is 420721823. The next prime is 420721837. The reversal of 420721832 is 238127024.

It is a junction number, because it is equal to n+sod(n) for n = 420721795 and 420721804.

It is not an unprimeable number, because it can be changed into a prime (420721837) by changing a digit.

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, 847982 + ... + 848477.

It is an arithmetic number, because the mean of its divisors is an integer number (50893800).

Almost surely, 2^420721832 is an apocalyptic number.

It is an amenable number.

420721832 is a deficient number, since it is larger than the sum of its proper divisors (393578968).

420721832 is a wasteful number, since it uses less digits than its factorization.

420721832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696496 (or 1696492 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 420721832 is about 20511.5048692191. The cubic root of 420721832 is about 749.3160175989.

Adding to 420721832 its reverse (238127024), we get a palindrome (658848856).

The spelling of 420721832 in words is "four hundred twenty million, seven hundred twenty-one thousand, eight hundred thirty-two".