432123209 has 12 divisors (see below), whose sum is σ = 503633988. Its totient is φ = 369684000.

The previous prime is 432123203. The next prime is 432123227. The reversal of 432123209 is 902321234.

It can be written as a sum of positive squares in 2 ways, for example, as 274068025 + 158055184 = 16555^2 + 12572^2 .

It is a de Polignac number, because none of the positive numbers 2^k-432123209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (432123203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18359 + ... + 34659.

It is an arithmetic number, because the mean of its divisors is an integer number (41969499).

Almost surely, 2^432123209 is an apocalyptic number.

432123209 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

432123209 is a deficient number, since it is larger than the sum of its proper divisors (71510779).

432123209 is a wasteful number, since it uses less digits than its factorization.

432123209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16856 (or 16849 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 432123209 is about 20787.5734274109. The cubic root of 432123209 is about 756.0244905189.

The spelling of 432123209 in words is "four hundred thirty-two million, one hundred twenty-three thousand, two hundred nine".