6440936 has 32 divisors (see below), whose sum is σ = 12587400. Its totient is φ = 3087360.

The previous prime is 6440933. The next prime is 6440939. The reversal of 6440936 is 6390446.

It is an interprime number because it is at equal distance from previous prime (6440933) and next prime (6440939).

It can be written as a sum of positive squares in 4 ways, for example, as 2464900 + 3976036 = 1570^2 + 1994^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23810 + ... + 24078.

Almost surely, 2^6440936 is an apocalyptic number.

It is an amenable number.

6440936 is a deficient number, since it is larger than the sum of its proper divisors (6146464).

6440936 is a wasteful number, since it uses less digits than its factorization.

6440936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 6440936 is about 2537.8999192246. The cubic root of 6440936 is about 186.0585625130.

The spelling of 6440936 in words is "six million, four hundred forty thousand, nine hundred thirty-six".