1986854538 has 16 divisors (see below), whose sum is σ = 4010847840. Its totient is φ = 656095056.

The previous prime is 1986854531. The next prime is 1986854543. The reversal of 1986854538 is 8354586891.

It is not an unprimeable number, because it can be changed into a prime (1986854531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546753 + ... + 1548036.

It is an arithmetic number, because the mean of its divisors is an integer number (250677990).

Almost surely, 2^1986854538 is an apocalyptic number.

1986854538 is an abundant number, since it is smaller than the sum of its proper divisors (2023993302).

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

1986854538 is a wasteful number, since it uses less digits than its factorization.

1986854538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094901.

The product of its digits is 8294400, while the sum is 57.

The square root of 1986854538 is about 44574.1465201522. The cubic root of 1986854538 is about 1257.1546059348.

The spelling of 1986854538 in words is "one billion, nine hundred eighty-six million, eight hundred fifty-four thousand, five hundred thirty-eight".