3681987 has 4 divisors (see below), whose sum is σ = 4909320. Its totient is φ = 2454656.

The previous prime is 3681967. The next prime is 3682031. The reversal of 3681987 is 7891863.

3681987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3681987 - 2⁸ = 3681731 is a prime.

It is a D-number.

3681987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3681917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613662 + ... + 613667.

It is an arithmetic number, because the mean of its divisors is an integer number (1227330).

Almost surely, 2^3681987 is an apocalyptic number.

3681987 is a deficient number, since it is larger than the sum of its proper divisors (1227333).

3681987 is a wasteful number, since it uses less digits than its factorization.

3681987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227332.

The product of its digits is 72576, while the sum is 42.

The square root of 3681987 is about 1918.8504371107. The cubic root of 3681987 is about 154.4166347841.

The spelling of 3681987 in words is "three million, six hundred eighty-one thousand, nine hundred eighty-seven".