3987005 has 16 divisors (see below), whose sum is σ = 5298048. Its totient is φ = 2856000.

The previous prime is 3987001. The next prime is 3987013. The reversal of 3987005 is 5007893.

3987005 = T₂₉₉ + T₃₀₀ + ... + T₃₆₉.

It is not a de Polignac number, because 3987005 - 2² = 3987001 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 (3987001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3395 + ... + 4415.

It is an arithmetic number, because the mean of its divisors is an integer number (331128).

Almost surely, 2^3987005 is an apocalyptic number.

It is an amenable number.

3987005 is a deficient number, since it is larger than the sum of its proper divisors (1311043).

3987005 is a wasteful number, since it uses less digits than its factorization.

3987005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 3987005 is about 1996.7486071111. The cubic root of 3987005 is about 158.5680163986.

The spelling of 3987005 in words is "three million, nine hundred eighty-seven thousand, five".