431634639 has 8 divisors (see below), whose sum is σ = 575614512. Its totient is φ = 287705600.

The previous prime is 431634551. The next prime is 431634661. The reversal of 431634639 is 936436134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 431634639 - 2²⁴ = 414857423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 431634597 and 431634606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431634689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17089 + ... + 33989.

It is an arithmetic number, because the mean of its divisors is an integer number (71951814).

Almost surely, 2^431634639 is an apocalyptic number.

431634639 is a deficient number, since it is larger than the sum of its proper divisors (143979873).

431634639 is a wasteful number, since it uses less digits than its factorization.

431634639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25417.

The product of its digits is 139968, while the sum is 39.

The square root of 431634639 is about 20775.8186120307. The cubic root of 431634639 is about 755.7394559331.

The spelling of 431634639 in words is "four hundred thirty-one million, six hundred thirty-four thousand, six hundred thirty-nine".