431405242 has 4 divisors (see below), whose sum is σ = 647107866. Its totient is φ = 215702620.

The previous prime is 431405201. The next prime is 431405257. The reversal of 431405242 is 242504134.

It is a happy number.

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., 220255281 + 211149961 = 14841^2 + 14531^2 .

It is a super-2 number, since 2×431405242² = 372220965650157128, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 107851309 + ... + 107851312.

Almost surely, 2^431405242 is an apocalyptic number.

431405242 is a deficient number, since it is larger than the sum of its proper divisors (215702624).

431405242 is a wasteful number, since it uses less digits than its factorization.

431405242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215702623.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 431405242 is about 20770.2971090931. The cubic root of 431405242 is about 755.6055501793.

Adding to 431405242 its reverse (242504134), we get a palindrome (673909376).

The spelling of 431405242 in words is "four hundred thirty-one million, four hundred five thousand, two hundred forty-two".