1987688 has 8 divisors (see below), whose sum is σ = 3726930. Its totient is φ = 993840.

The previous prime is 1987681. The next prime is 1987693. The reversal of 1987688 is 8867891.

It can be written as a sum of positive squares in only one way, i.e., 1898884 + 88804 = 1378^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1987681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124223 + ... + 124238.

2^1987688 is an apocalyptic number.

It is an amenable number.

1987688 is a deficient number, since it is larger than the sum of its proper divisors (1739242).

1987688 is a wasteful number, since it uses less digits than its factorization.

1987688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248467 (or 248463 counting only the distinct ones).

The product of its digits is 193536, while the sum is 47.

The square root of 1987688 is about 1409.8538931393. The cubic root of 1987688 is about 125.7330368527.

The spelling of 1987688 in words is "one million, nine hundred eighty-seven thousand, six hundred eighty-eight".