431628394 has 4 divisors (see below), whose sum is σ = 647442594. Its totient is φ = 215814196.

The previous prime is 431628391. The next prime is 431628397. The reversal of 431628394 is 493826134.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (431628391) and next prime (431628397).

It can be written as a sum of positive squares in only one way, i.e., 369139369 + 62489025 = 19213^2 + 7905^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (431628391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107907097 + ... + 107907100.

Almost surely, 2^431628394 is an apocalyptic number.

431628394 is a deficient number, since it is larger than the sum of its proper divisors (215814200).

431628394 is a wasteful number, since it uses less digits than its factorization.

431628394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215814199.

The product of its digits is 124416, while the sum is 40.

The square root of 431628394 is about 20775.6683165669. The cubic root of 431628394 is about 755.7358111718.

The spelling of 431628394 in words is "four hundred thirty-one million, six hundred twenty-eight thousand, three hundred ninety-four".