811861384 has 16 divisors (see below), whose sum is σ = 1611783900. Its totient is φ = 382052352.

The previous prime is 811861373. The next prime is 811861399. The reversal of 811861384 is 483168118.

It can be written as a sum of positive squares in 2 ways, for example, as 810996484 + 864900 = 28478^2 + 930^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984649 + ... + 2984920.

Almost surely, 2^811861384 is an apocalyptic number.

It is an amenable number.

811861384 is a deficient number, since it is larger than the sum of its proper divisors (799922516).

811861384 is a wasteful number, since it uses less digits than its factorization.

811861384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5969592 (or 5969588 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 811861384 is about 28493.1813597569. The cubic root of 811861384 is about 932.8832490891.

The spelling of 811861384 in words is "eight hundred eleven million, eight hundred sixty-one thousand, three hundred eighty-four".