3981787 has 4 divisors (see below), whose sum is σ = 4119120. Its totient is φ = 3844456.

The previous prime is 3981767. The next prime is 3981821. The reversal of 3981787 is 7871893.

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 3981787 - 2¹¹ = 3979739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981707) 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 3 ways as a sum of consecutive naturals, for example, 68623 + ... + 68680.

It is an arithmetic number, because the mean of its divisors is an integer number (1029780).

Almost surely, 2^3981787 is an apocalyptic number.

3981787 is a deficient number, since it is larger than the sum of its proper divisors (137333).

3981787 is a wasteful number, since it uses less digits than its factorization.

3981787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137332.

The product of its digits is 84672, while the sum is 43.

The square root of 3981787 is about 1995.4415551451. The cubic root of 3981787 is about 158.4988108062.

The spelling of 3981787 in words is "three million, nine hundred eighty-one thousand, seven hundred eighty-seven".