1979988 has 12 divisors (see below), whose sum is σ = 4620000. Its totient is φ = 659992.

The previous prime is 1979947. The next prime is 1979993. The reversal of 1979988 is 8899791.

1979988 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1979988.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82488 + ... + 82511.

It is an arithmetic number, because the mean of its divisors is an integer number (385000).

2^1979988 is an apocalyptic number.

It is an amenable number.

1979988 is an abundant number, since it is smaller than the sum of its proper divisors (2640012).

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

1979988 is a wasteful number, since it uses less digits than its factorization.

1979988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165006 (or 165004 counting only the distinct ones).

The product of its digits is 326592, while the sum is 51.

The square root of 1979988 is about 1407.1204639262. The cubic root of 1979988 is about 125.5704698856.

The spelling of 1979988 in words is "one million, nine hundred seventy-nine thousand, nine hundred eighty-eight".