1987556 has 6 divisors (see below), whose sum is σ = 3478230. Its totient is φ = 993776.

The previous prime is 1987549. The next prime is 1987577. The reversal of 1987556 is 6557891.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 27556 = 1400^2 + 166^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248441 + ... + 248448.

It is an arithmetic number, because the mean of its divisors is an integer number (579705).

2^1987556 is an apocalyptic number.

It is an amenable number.

1987556 is a deficient number, since it is larger than the sum of its proper divisors (1490674).

1987556 is a wasteful number, since it uses less digits than its factorization.

1987556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496893 (or 496891 counting only the distinct ones).

The product of its digits is 75600, while the sum is 41.

The square root of 1987556 is about 1409.8070790005. The cubic root of 1987556 is about 125.7302535306.

The spelling of 1987556 in words is "one million, nine hundred eighty-seven thousand, five hundred fifty-six".