3987331 has 4 divisors (see below), whose sum is σ = 4000464. Its totient is φ = 3974200.

The previous prime is 3987323. The next prime is 3987353. The reversal of 3987331 is 1337893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1337893 = 541 ⋅2473.

It is a cyclic number.

It is not a de Polignac number, because 3987331 - 2³ = 3987323 is a prime.

It is a super-2 number, since 2×3987331² = 31797617007122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3987301) 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, 6100 + ... + 6721.

It is an arithmetic number, because the mean of its divisors is an integer number (1000116).

Almost surely, 2^3987331 is an apocalyptic number.

3987331 is a deficient number, since it is larger than the sum of its proper divisors (13133).

3987331 is a wasteful number, since it uses less digits than its factorization.

3987331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13132.

The product of its digits is 13608, while the sum is 34.

The square root of 3987331 is about 1996.8302381525. The cubic root of 3987331 is about 158.5723380858.

The spelling of 3987331 in words is "three million, nine hundred eighty-seven thousand, three hundred thirty-one".