3987643 has 8 divisors (see below), whose sum is σ = 4379760. Its totient is φ = 3600480.

The previous prime is 3987629. The next prime is 3987649. The reversal of 3987643 is 3467893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3987643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3987596 and 3987605.

It is not an unprimeable number, because it can be changed into a prime (3987649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 573 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (547470).

Almost surely, 2^3987643 is an apocalyptic number.

3987643 is a deficient number, since it is larger than the sum of its proper divisors (392117).

3987643 is a wasteful number, since it uses less digits than its factorization.

3987643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477.

The product of its digits is 108864, while the sum is 40.

The square root of 3987643 is about 1996.9083604412. The cubic root of 3987643 is about 158.5764739584.

The spelling of 3987643 in words is "three million, nine hundred eighty-seven thousand, six hundred forty-three".