1987506 has 24 divisors (see below), whose sum is σ = 4350060. Its totient is φ = 655776.

The previous prime is 1987501. The next prime is 1987519. The reversal of 1987506 is 6057891.

It can be written as a sum of positive squares in 2 ways, for example, as 1846881 + 140625 = 1359^2 + 375^2 .

It is not an unprimeable number, because it can be changed into a prime (1987501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1456 + ... + 2468.

2^1987506 is an apocalyptic number.

1987506 is an abundant number, since it is smaller than the sum of its proper divisors (2362554).

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

1987506 is a wasteful number, since it uses less digits than its factorization.

1987506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1987506 is about 1409.7893459663. The cubic root of 1987506 is about 125.7291992097.

The spelling of 1987506 in words is "one million, nine hundred eighty-seven thousand, five hundred six".