1287988 has 48 divisors (see below), whose sum is σ = 2709504. Its totient is φ = 529920.

The previous prime is 1287983. The next prime is 1287989. The reversal of 1287988 is 8897821.

Its product of digits (64512) is a multiple of the sum of its prime factors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287983) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27381 + ... + 27427.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2^1287988 is an apocalyptic number.

It is an amenable number.

1287988 is an abundant number, since it is smaller than the sum of its proper divisors (1421516).

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

1287988 is a wasteful number, since it uses less digits than its factorization.

1287988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 110 counting only the distinct ones).

The product of its digits is 64512, while the sum is 43.

The square root of 1287988 is about 1134.8955899112. The cubic root of 1287988 is about 108.8020986115.

The spelling of 1287988 in words is "one million, two hundred eighty-seven thousand, nine hundred eighty-eight".