6403431 has 8 divisors (see below), whose sum is σ = 8736640. Its totient is φ = 4169592.

The previous prime is 6403429. The next prime is 6403433. The reversal of 6403431 is 1343046.

It is an interprime number because it is at equal distance from previous prime (6403429) and next prime (6403433).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6403431 - 2¹ = 6403429 is a prime.

It is a super-2 number, since 2×6403431² = 82007857143522, which contains 22 as substring.

It is the 2531-st Hogben number.

It is a Duffinian number.

6403431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6403398 and 6403407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403433) by changing a digit.

It is a nontrivial repunit in base 2530.

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 7 ways as a sum of consecutive naturals, for example, 24691 + ... + 24948.

It is an arithmetic number, because the mean of its divisors is an integer number (1092080).

Almost surely, 2^6403431 is an apocalyptic number.

6403431 is a deficient number, since it is larger than the sum of its proper divisors (2333209).

6403431 is a wasteful number, since it uses less digits than its factorization.

6403431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49685.

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

The square root of 6403431 is about 2530.5001481921. The cubic root of 6403431 is about 185.6967251077.

Adding to 6403431 its reverse (1343046), we get a palindrome (7746477).

The spelling of 6403431 in words is "six million, four hundred three thousand, four hundred thirty-one".