431440402 has 4 divisors (see below), whose sum is σ = 647160606. Its totient is φ = 215720200.

The previous prime is 431440381. The next prime is 431440411. The reversal of 431440402 is 204044134.

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., 396049801 + 35390601 = 19901^2 + 5949^2 .

It is a super-2 number, since 2×431440402² = 372281640955843208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 107860099 + ... + 107860102.

Almost surely, 2^431440402 is an apocalyptic number.

431440402 is a deficient number, since it is larger than the sum of its proper divisors (215720204).

431440402 is a wasteful number, since it uses less digits than its factorization.

431440402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215720203.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 431440402 is about 20771.1434928364. The cubic root of 431440402 is about 755.6260771817.

Adding to 431440402 its reverse (204044134), we get a palindrome (635484536).

The spelling of 431440402 in words is "four hundred thirty-one million, four hundred forty thousand, four hundred two".