3988657 has 4 divisors (see below), whose sum is σ = 4011120. Its totient is φ = 3966196.

The previous prime is 3988643. The next prime is 3988661. The reversal of 3988657 is 7568893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7568893 = 17 ⋅445229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3988657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3988627) 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, 10963 + ... + 11320.

It is an arithmetic number, because the mean of its divisors is an integer number (1002780).

Almost surely, 2^3988657 is an apocalyptic number.

It is an amenable number.

3988657 is a deficient number, since it is larger than the sum of its proper divisors (22463).

3988657 is a wasteful number, since it uses less digits than its factorization.

3988657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22462.

The product of its digits is 362880, while the sum is 46.

The square root of 3988657 is about 1997.1622367750. The cubic root of 3988657 is about 158.5899140546.

The spelling of 3988657 in words is "three million, nine hundred eighty-eight thousand, six hundred fifty-seven".