1986061840 has 40 divisors (see below), whose sum is σ = 5277251520. Its totient is φ = 680935296.

The previous prime is 1986061829. The next prime is 1986061843. The reversal of 1986061840 is 481606891.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1986061843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1772710 + ... + 1773829.

It is an arithmetic number, because the mean of its divisors is an integer number (131931288).

Almost surely, 2^1986061840 is an apocalyptic number.

1986061840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1986061840 is an abundant number, since it is smaller than the sum of its proper divisors (3291189680).

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

1986061840 is a wasteful number, since it uses less digits than its factorization.

1986061840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546559 (or 3546553 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1986061840 is about 44565.2537297837. The cubic root of 1986061840 is about 1256.9873941464.

The spelling of 1986061840 in words is "one billion, nine hundred eighty-six million, sixty-one thousand, eight hundred forty".