1987728 has 20 divisors (see below), whose sum is σ = 5135088. Its totient is φ = 662560.

The previous prime is 1987709. The next prime is 1987789. The reversal of 1987728 is 8277891.

It is a self number, because there is not a number n which added to its sum of digits gives 1987728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20658 + ... + 20753.

2^1987728 is an apocalyptic number.

It is an amenable number.

1987728 is an abundant number, since it is smaller than the sum of its proper divisors (3147360).

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

1987728 is a wasteful number, since it uses less digits than its factorization.

1987728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41422 (or 41416 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 1987728 is about 1409.8680789350. The cubic root of 1987728 is about 125.7338802594.

The spelling of 1987728 in words is "one million, nine hundred eighty-seven thousand, seven hundred twenty-eight".