806641386 has 32 divisors (see below), whose sum is σ = 1673453760. Its totient is φ = 259023744.

The previous prime is 806641379. The next prime is 806641387. The reversal of 806641386 is 683146608.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (806641387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2581 + ... + 40248.

It is an arithmetic number, because the mean of its divisors is an integer number (52295430).

Almost surely, 2^806641386 is an apocalyptic number.

806641386 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

806641386 is an abundant number, since it is smaller than the sum of its proper divisors (866812374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

806641386 is a wasteful number, since it uses less digits than its factorization.

806641386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42950.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 806641386 is about 28401.4328159690. The cubic root of 806641386 is about 930.8795725294.

It can be divided in two parts, 80 and 6641386, that added together give a palindrome (6641466).

The spelling of 806641386 in words is "eight hundred six million, six hundred forty-one thousand, three hundred eighty-six".