7643818 has 16 divisors (see below), whose sum is σ = 14112000. Its totient is φ = 3023856.

The previous prime is 7643813. The next prime is 7643827. The reversal of 7643818 is 8183467.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (7643813) 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, 20818 + ... + 21181.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^7643818 is an apocalyptic number.

7643818 is a deficient number, since it is larger than the sum of its proper divisors (6468182).

7643818 is a wasteful number, since it uses less digits than its factorization.

7643818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42021.

The product of its digits is 32256, while the sum is 37.

The square root of 7643818 is about 2764.7455579131. The cubic root of 7643818 is about 196.9866430859.

The spelling of 7643818 in words is "seven million, six hundred forty-three thousand, eight hundred eighteen".