6640412 has 6 divisors (see below), whose sum is σ = 11620728. Its totient is φ = 3320204.

The previous prime is 6640411. The next prime is 6640429. The reversal of 6640412 is 2140466.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640411) 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 as a sum of consecutive naturals, namely, 830048 + ... + 830055.

It is an arithmetic number, because the mean of its divisors is an integer number (1936788).

Almost surely, 2^6640412 is an apocalyptic number.

It is an amenable number.

6640412 is a deficient number, since it is larger than the sum of its proper divisors (4980316).

6640412 is a wasteful number, since it uses less digits than its factorization.

6640412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660107 (or 1660105 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 6640412 is about 2576.8996876091. The cubic root of 6640412 is about 187.9598148605.

Adding to 6640412 its reverse (2140466), we get a palindrome (8780878).

The spelling of 6640412 in words is "six million, six hundred forty thousand, four hundred twelve".