403312431 has 4 divisors (see below), whose sum is σ = 537749912. Its totient is φ = 268874952.

The previous prime is 403312421. The next prime is 403312453. The reversal of 403312431 is 134213304.

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

It is not a de Polignac number, because 403312431 - 2⁷ = 403312303 is a prime.

It is a super-2 number, since 2×403312431² = 325321833998259522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 403312398 and 403312407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403312421) 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 in 3 ways as a sum of consecutive naturals, for example, 67218736 + ... + 67218741.

It is an arithmetic number, because the mean of its divisors is an integer number (134437478).

Almost surely, 2^403312431 is an apocalyptic number.

403312431 is a deficient number, since it is larger than the sum of its proper divisors (134437481).

403312431 is a wasteful number, since it uses less digits than its factorization.

403312431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134437480.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 403312431 is about 20082.6400405923. The cubic root of 403312431 is about 738.8345612818.

Adding to 403312431 its reverse (134213304), we get a palindrome (537525735).

The spelling of 403312431 in words is "four hundred three million, three hundred twelve thousand, four hundred thirty-one".