806139444 has 48 divisors (see below), whose sum is σ = 2082640896. Its totient is φ = 240636000.

The previous prime is 806139437. The next prime is 806139449. The reversal of 806139444 is 444931608.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806139449) 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, 36732 + ... + 54419.

It is an arithmetic number, because the mean of its divisors is an integer number (43388352).

Almost surely, 2^806139444 is an apocalyptic number.

It is an amenable number.

806139444 is an abundant number, since it is smaller than the sum of its proper divisors (1276501452).

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

806139444 is a wasteful number, since it uses less digits than its factorization.

806139444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91236 (or 91234 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 806139444 is about 28392.5948796513. The cubic root of 806139444 is about 930.6864489131.

The spelling of 806139444 in words is "eight hundred six million, one hundred thirty-nine thousand, four hundred forty-four".