806491900 has 72 divisors (see below), whose sum is σ = 1866911760. Its totient is φ = 301347840.

The previous prime is 806491897. The next prime is 806491901. The reversal of 806491900 is 9194608.

It is a super-2 number, since 2×806491900² = 1300858369531220000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 806491900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806491901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234594 + ... + 238006.

It is an arithmetic number, because the mean of its divisors is an integer number (25929330).

Almost surely, 2^806491900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 806491900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933455880).

806491900 is an abundant number, since it is smaller than the sum of its proper divisors (1060419860).

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

806491900 is a wasteful number, since it uses less digits than its factorization.

806491900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 806491900 is about 28398.8010310295. The cubic root of 806491900 is about 930.8220657435.

The spelling of 806491900 in words is "eight hundred six million, four hundred ninety-one thousand, nine hundred".