3988139 has 4 divisors (see below), whose sum is σ = 4004280. Its totient is φ = 3972000.

The previous prime is 3988129. The next prime is 3988147. The reversal of 3988139 is 9318893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3988139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3988096 and 3988105.

It is not an unprimeable number, because it can be changed into a prime (3988129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7694 + ... + 8195.

It is an arithmetic number, because the mean of its divisors is an integer number (1001070).

Almost surely, 2^3988139 is an apocalyptic number.

3988139 is a deficient number, since it is larger than the sum of its proper divisors (16141).

3988139 is a wasteful number, since it uses less digits than its factorization.

3988139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16140.

The product of its digits is 46656, while the sum is 41.

The square root of 3988139 is about 1997.0325485580. The cubic root of 3988139 is about 158.5830484913.

The spelling of 3988139 in words is "three million, nine hundred eighty-eight thousand, one hundred thirty-nine".