432400421 has 4 divisors (see below), whose sum is σ = 433055244. Its totient is φ = 431745600.

The previous prime is 432400403. The next prime is 432400433. The reversal of 432400421 is 124004234.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 371949796 + 60450625 = 19286^2 + 7775^2 .

It is a cyclic number.

It is not a de Polignac number, because 432400421 - 2²² = 428206117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 432400393 and 432400402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (432400471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326420 + ... + 327741.

It is an arithmetic number, because the mean of its divisors is an integer number (108263811).

Almost surely, 2^432400421 is an apocalyptic number.

It is an amenable number.

432400421 is a deficient number, since it is larger than the sum of its proper divisors (654823).

432400421 is an equidigital number, since it uses as much as digits as its factorization.

432400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654822.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 432400421 is about 20794.2400919101. The cubic root of 432400421 is about 756.1861220913.

Adding to 432400421 its reverse (124004234), we get a palindrome (556404655).

The spelling of 432400421 in words is "four hundred thirty-two million, four hundred thousand, four hundred twenty-one".