1986968939 has 4 divisors (see below), whose sum is σ = 1988635656. Its totient is φ = 1985302224.

The previous prime is 1986968927. The next prime is 1986969001. The reversal of 1986968939 is 9398696891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1986968939 - 2²⁴ = 1970191723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1986964939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831569 + ... + 833954.

It is an arithmetic number, because the mean of its divisors is an integer number (497158914).

Almost surely, 2^1986968939 is an apocalyptic number.

1986968939 is a deficient number, since it is larger than the sum of its proper divisors (1666717).

1986968939 is a wasteful number, since it uses less digits than its factorization.

1986968939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666716.

The product of its digits is 45349632, while the sum is 68.

The square root of 1986968939 is about 44575.4297679787. The cubic root of 1986968939 is about 1257.1787340195.

The spelling of 1986968939 in words is "one billion, nine hundred eighty-six million, nine hundred sixty-eight thousand, nine hundred thirty-nine".