3987751 has 4 divisors (see below), whose sum is σ = 4055400. Its totient is φ = 3920104.

The previous prime is 3987733. The next prime is 3987757. The reversal of 3987751 is 1577893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1577893 = 19 ⋅83047.

It is a cyclic number.

It is not a de Polignac number, because 3987751 - 2²¹ = 1890599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987757) 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, 33736 + ... + 33853.

It is an arithmetic number, because the mean of its divisors is an integer number (1013850).

Almost surely, 2^3987751 is an apocalyptic number.

3987751 is a deficient number, since it is larger than the sum of its proper divisors (67649).

3987751 is an equidigital number, since it uses as much as digits as its factorization.

3987751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67648.

The product of its digits is 52920, while the sum is 40.

The square root of 3987751 is about 1996.9354020599. The cubic root of 3987751 is about 158.5779055563.

The spelling of 3987751 in words is "three million, nine hundred eighty-seven thousand, seven hundred fifty-one".