431638238 has 16 divisors (see below), whose sum is σ = 682791120. Its totient is φ = 204083136.

The previous prime is 431638237. The next prime is 431638241. The reversal of 431638238 is 832836134.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431638237) 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, 10970 + ... + 31362.

It is an arithmetic number, because the mean of its divisors is an integer number (42674445).

Almost surely, 2^431638238 is an apocalyptic number.

431638238 is a deficient number, since it is larger than the sum of its proper divisors (251152882).

431638238 is a wasteful number, since it uses less digits than its factorization.

431638238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20971.

The product of its digits is 82944, while the sum is 38.

The square root of 431638238 is about 20775.9052269691. The cubic root of 431638238 is about 755.7415563969.

The spelling of 431638238 in words is "four hundred thirty-one million, six hundred thirty-eight thousand, two hundred thirty-eight".