1987100 has 36 divisors (see below), whose sum is σ = 4458048. Its totient is φ = 768000.

The previous prime is 1987099. The next prime is 1987121. The reversal of 1987100 is 17891.

It is a self number, because there is not a number n which added to its sum of digits gives 1987100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2780 + ... + 3420.

2^1987100 is an apocalyptic number.

1987100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2229024).

1987100 is an abundant number, since it is smaller than the sum of its proper divisors (2470948).

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

1987100 is a wasteful number, since it uses less digits than its factorization.

1987100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1987100 is about 1409.6453454681. The cubic root of 1987100 is about 125.7206374693.

The spelling of 1987100 in words is "one million, nine hundred eighty-seven thousand, one hundred".