3999472805 has 4 divisors (see below), whose sum is σ = 4799367372. Its totient is φ = 3199578240.

The previous prime is 3999472787. The next prime is 3999472847. The reversal of 3999472805 is 5082749993.

3999472805 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3157428481 + 842044324 = 56191^2 + 29018^2 .

It is not a de Polignac number, because 3999472805 - 2⁸ = 3999472549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399947276 + ... + 399947285.

It is an arithmetic number, because the mean of its divisors is an integer number (1199841843).

Almost surely, 2^3999472805 is an apocalyptic number.

It is an amenable number.

3999472805 is a deficient number, since it is larger than the sum of its proper divisors (799894567).

3999472805 is an equidigital number, since it uses as much as digits as its factorization.

3999472805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799894566.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 3999472805 is about 63241.3852236018. The cubic root of 3999472805 is about 1587.3313097460.

The spelling of 3999472805 in words is "three billion, nine hundred ninety-nine million, four hundred seventy-two thousand, eight hundred five".