811138988 has 36 divisors (see below), whose sum is σ = 1562739360. Its totient is φ = 368116320.

The previous prime is 811138987. The next prime is 811139009. The reversal of 811138988 is 889831118.

It is not an unprimeable number, because it can be changed into a prime (811138981) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 502070 + ... + 503682.

Almost surely, 2^811138988 is an apocalyptic number.

It is an amenable number.

811138988 is a deficient number, since it is larger than the sum of its proper divisors (751600372).

811138988 is a wasteful number, since it uses less digits than its factorization.

811138988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678 (or 2665 counting only the distinct ones).

The product of its digits is 110592, while the sum is 47.

The square root of 811138988 is about 28480.5018916451. The cubic root of 811138988 is about 932.6064731426.

The spelling of 811138988 in words is "eight hundred eleven million, one hundred thirty-eight thousand, nine hundred eighty-eight".