431729138 has 4 divisors (see below), whose sum is σ = 647593710. Its totient is φ = 215864568.

The previous prime is 431729131. The next prime is 431729141. The reversal of 431729138 is 831927134.

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

It can be written as a sum of positive squares in only one way, i.e., 355812769 + 75916369 = 18863^2 + 8713^2 .

It is not an unprimeable number, because it can be changed into a prime (431729131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107932283 + ... + 107932286.

Almost surely, 2^431729138 is an apocalyptic number.

431729138 is a deficient number, since it is larger than the sum of its proper divisors (215864572).

431729138 is a wasteful number, since it uses less digits than its factorization.

431729138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215864571.

The product of its digits is 36288, while the sum is 38.

The square root of 431729138 is about 20778.0927421166. The cubic root of 431729138 is about 755.7946039721.

The spelling of 431729138 in words is "four hundred thirty-one million, seven hundred twenty-nine thousand, one hundred thirty-eight".