7881806 has 16 divisors (see below), whose sum is σ = 12165120. Its totient is φ = 3828120.

The previous prime is 7881803. The next prime is 7881817. The reversal of 7881806 is 6081887.

It is a self number, because there is not a number n which added to its sum of digits gives 7881806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17735 + ... + 18173.

It is an arithmetic number, because the mean of its divisors is an integer number (760320).

Almost surely, 2^7881806 is an apocalyptic number.

7881806 is a deficient number, since it is larger than the sum of its proper divisors (4283314).

7881806 is a wasteful number, since it uses less digits than its factorization.

7881806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 7881806 is about 2807.4554315251. The cubic root of 7881806 is about 199.0101591575.

The spelling of 7881806 in words is "seven million, eight hundred eighty-one thousand, eight hundred six".