6442731 has 6 divisors (see below), whose sum is σ = 9306180. Its totient is φ = 4295148.

The previous prime is 6442721. The next prime is 6442763. The reversal of 6442731 is 1372446.

It is not a de Polignac number, because 6442731 - 2¹¹ = 6440683 is a prime.

It is a super-2 number, since 2×6442731² = 83017565476722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6442695 and 6442704.

It is not an unprimeable number, because it can be changed into a prime (6442721) 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 5 ways as a sum of consecutive naturals, for example, 357921 + ... + 357938.

It is an arithmetic number, because the mean of its divisors is an integer number (1551030).

Almost surely, 2^6442731 is an apocalyptic number.

6442731 is a deficient number, since it is larger than the sum of its proper divisors (2863449).

6442731 is a wasteful number, since it uses less digits than its factorization.

6442731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715865 (or 715862 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 6442731 is about 2538.2535334359. The cubic root of 6442731 is about 186.0758448925.

It can be divided in two parts, 644 and 2731, that added together give a cube (3375 = 15³).

The spelling of 6442731 in words is "six million, four hundred forty-two thousand, seven hundred thirty-one".