432312821 has 4 divisors (see below), whose sum is σ = 432361644. Its totient is φ = 432264000.

The previous prime is 432312817. The next prime is 432312869. The reversal of 432312821 is 128213234.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26894596 + 405418225 = 5186^2 + 20135^2 .

It is a cyclic number.

It is not a de Polignac number, because 432312821 - 2² = 432312817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (432314821) 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, 6980 + ... + 30221.

It is an arithmetic number, because the mean of its divisors is an integer number (108090411).

Almost surely, 2^432312821 is an apocalyptic number.

It is an amenable number.

432312821 is a deficient number, since it is larger than the sum of its proper divisors (48823).

432312821 is a wasteful number, since it uses less digits than its factorization.

432312821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48822.

The product of its digits is 2304, while the sum is 26.

The square root of 432312821 is about 20792.1336326987. The cubic root of 432312821 is about 756.1350533944.

The spelling of 432312821 in words is "four hundred thirty-two million, three hundred twelve thousand, eight hundred twenty-one".