1987979933 has 4 divisors (see below), whose sum is σ = 1988100288. Its totient is φ = 1987859580.

The previous prime is 1987979927. The next prime is 1987979941. The reversal of 1987979933 is 3399797891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1987979933 - 2¹² = 1987975837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1987979933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987979923) 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 3 ways as a sum of consecutive naturals, for example, 30533 + ... + 70058.

It is an arithmetic number, because the mean of its divisors is an integer number (497025072).

Almost surely, 2^1987979933 is an apocalyptic number.

It is an amenable number.

1987979933 is a deficient number, since it is larger than the sum of its proper divisors (120355).

1987979933 is a wasteful number, since it uses less digits than its factorization.

1987979933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120354.

The product of its digits is 23147208, while the sum is 65.

The square root of 1987979933 is about 44586.7685866558. The cubic root of 1987979933 is about 1257.3919204843.

The spelling of 1987979933 in words is "one billion, nine hundred eighty-seven million, nine hundred seventy-nine thousand, nine hundred thirty-three".