6440913 has 6 divisors (see below), whose sum is σ = 9303554. Its totient is φ = 4293936.

The previous prime is 6440893. The next prime is 6440933. The reversal of 6440913 is 3190446.

6440913 is a `hidden beast` number, since 644 + 0 + 9 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (6440893) and next prime (6440933).

It can be written as a sum of positive squares in only one way, i.e., 6066369 + 374544 = 2463^2 + 612^2 .

It is not a de Polignac number, because 6440913 - 2⁵ = 6440881 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

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 5 ways as a sum of consecutive naturals, for example, 357820 + ... + 357837.

Almost surely, 2^6440913 is an apocalyptic number.

It is an amenable number.

6440913 is a deficient number, since it is larger than the sum of its proper divisors (2862641).

6440913 is a wasteful number, since it uses less digits than its factorization.

6440913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715663 (or 715660 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 6440913 is about 2537.8953879150. The cubic root of 6440913 is about 186.0583410466.

The spelling of 6440913 in words is "six million, four hundred forty thousand, nine hundred thirteen".