421732720 has 40 divisors (see below), whose sum is σ = 990655344. Its totient is φ = 166950912.

The previous prime is 421732709. The next prime is 421732723. The reversal of 421732720 is 27237124.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421732723) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19414 + ... + 34933.

Almost surely, 2^421732720 is an apocalyptic number.

421732720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421732720 is an abundant number, since it is smaller than the sum of its proper divisors (568922624).

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

421732720 is a wasteful number, since it uses less digits than its factorization.

421732720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54457 (or 54451 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 421732720 is about 20536.1320603467. The cubic root of 421732720 is about 749.9156764457.

Adding to 421732720 its reverse (27237124), we get a palindrome (448969844).

The spelling of 421732720 in words is "four hundred twenty-one million, seven hundred thirty-two thousand, seven hundred twenty".