1987928 has 16 divisors (see below), whose sum is σ = 3749760. Its totient is φ = 988000.

The previous prime is 1987919. The next prime is 1987939. The reversal of 1987928 is 8297891.

It is an Ulam number.

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, 878 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (234360).

2^1987928 is an apocalyptic number.

It is an amenable number.

1987928 is a deficient number, since it is larger than the sum of its proper divisors (1761832).

1987928 is a wasteful number, since it uses less digits than its factorization.

1987928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1494 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The square root of 1987928 is about 1409.9390057729. The cubic root of 1987928 is about 125.7380971228.

The spelling of 1987928 in words is "one million, nine hundred eighty-seven thousand, nine hundred twenty-eight".