1988987 has 16 divisors (see below), whose sum is σ = 2671872. Its totient is φ = 1429920.

The previous prime is 1988963. The next prime is 1988999. The reversal of 1988987 is 7898891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1988987 - 2¹² = 1984891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (166992).

2^1988987 is an apocalyptic number.

1988987 is a deficient number, since it is larger than the sum of its proper divisors (682885).

1988987 is a wasteful number, since it uses less digits than its factorization.

1988987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018.

The product of its digits is 290304, while the sum is 50.

The square root of 1988987 is about 1410.3145039317. The cubic root of 1988987 is about 125.7604207025.

The spelling of 1988987 in words is "one million, nine hundred eighty-eight thousand, nine hundred eighty-seven".