1987888 has 20 divisors (see below), whose sum is σ = 4402000. Its totient is φ = 851904.

The previous prime is 1987883. The next prime is 1987889. The reversal of 1987888 is 8887891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8763 + ... + 8986.

It is an arithmetic number, because the mean of its divisors is an integer number (220100).

2^1987888 is an apocalyptic number.

It is an amenable number.

1987888 is an abundant number, since it is smaller than the sum of its proper divisors (2414112).

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

1987888 is a wasteful number, since it uses less digits than its factorization.

1987888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17764 (or 17758 counting only the distinct ones).

The product of its digits is 258048, while the sum is 49.

The square root of 1987888 is about 1409.9248206908. The cubic root of 1987888 is about 125.7372537728.

The spelling of 1987888 in words is "one million, nine hundred eighty-seven thousand, eight hundred eighty-eight".