3987657 has 16 divisors (see below), whose sum is σ = 5964480. Its totient is φ = 2632896.

The previous prime is 3987649. The next prime is 3987677. The reversal of 3987657 is 7567893.

3987657 = 129² + 130² + ... + 241².

It is a happy number.

It is not a de Polignac number, because 3987657 - 2³ = 3987649 is a prime.

3987657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3987677) 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, 2398 + ... + 3704.

It is an arithmetic number, because the mean of its divisors is an integer number (372780).

Almost surely, 2^3987657 is an apocalyptic number.

It is an amenable number.

3987657 is a deficient number, since it is larger than the sum of its proper divisors (1976823).

3987657 is a wasteful number, since it uses less digits than its factorization.

3987657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429 (or 1423 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 3987657 is about 1996.9118658569. The cubic root of 3987657 is about 158.5766595373.

The spelling of 3987657 in words is "three million, nine hundred eighty-seven thousand, six hundred fifty-seven".