1987065 has 32 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 1031040.

The previous prime is 1987057. The next prime is 1987067. The reversal of 1987065 is 5607891.

It is not a de Polignac number, because 1987065 - 2³ = 1987057 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5356 + ... + 5714.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

2^1987065 is an apocalyptic number.

1987065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1987065 is a deficient number, since it is larger than the sum of its proper divisors (1641735).

1987065 is a wasteful number, since it uses less digits than its factorization.

1987065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 408 counting only the distinct ones).

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

The square root of 1987065 is about 1409.6329309434. The cubic root of 1987065 is about 125.7198993336.

The spelling of 1987065 in words is "one million, nine hundred eighty-seven thousand, sixty-five".