6438631 has 6 divisors (see below), whose sum is σ = 6839960. Its totient is φ = 6059616.

The previous prime is 6438617. The next prime is 6438637. The reversal of 6438631 is 1368346.

It is not a de Polignac number, because 6438631 - 2¹¹ = 6436583 is a prime.

It is a super-2 number, since 2×6438631² = 82911938308322, 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 = 6438593 and 6438602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10851 + ... + 11428.

Almost surely, 2^6438631 is an apocalyptic number.

6438631 is a deficient number, since it is larger than the sum of its proper divisors (401329).

6438631 is a wasteful number, since it uses less digits than its factorization.

6438631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22313 (or 22296 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 6438631 is about 2537.4457629672. The cubic root of 6438631 is about 186.0363651100.

The spelling of 6438631 in words is "six million, four hundred thirty-eight thousand, six hundred thirty-one".