8139542985 has 40 divisors (see below), whose sum is σ = 16675302336. Its totient is φ = 3720932640.

The previous prime is 8139542951. The next prime is 8139543007. The reversal of 8139542985 is 5892459318.

8139542985 is a `hidden beast` number, since 8 + 1 + 3 + 9 + 542 + 98 + 5 = 666.

It is not a de Polignac number, because 8139542985 - 2⁶ = 8139542921 is a prime.

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 39 ways as a sum of consecutive naturals, for example, 1432711 + ... + 1438380.

Almost surely, 2^8139542985 is an apocalyptic number.

It is an amenable number.

8139542985 is an abundant number, since it is smaller than the sum of its proper divisors (8535759351).

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

8139542985 is a wasteful number, since it uses less digits than its factorization.

8139542985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871115 (or 2871106 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 8139542985 is about 90219.4157872905. The cubic root of 8139542985 is about 2011.5616177926.

The spelling of 8139542985 in words is "eight billion, one hundred thirty-nine million, five hundred forty-two thousand, nine hundred eighty-five".