3994139 has 4 divisors (see below), whose sum is σ = 4018224. Its totient is φ = 3970056.

The previous prime is 3994121. The next prime is 3994147. The reversal of 3994139 is 9314993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9314993 = 673 ⋅13841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3994139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3994189) 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, 11792 + ... + 12125.

It is an arithmetic number, because the mean of its divisors is an integer number (1004556).

Almost surely, 2^3994139 is an apocalyptic number.

3994139 is a deficient number, since it is larger than the sum of its proper divisors (24085).

3994139 is a wasteful number, since it uses less digits than its factorization.

3994139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24084.

The product of its digits is 26244, while the sum is 38.

The square root of 3994139 is about 1998.5342128670. The cubic root of 3994139 is about 158.6625359853.

The spelling of 3994139 in words is "three million, nine hundred ninety-four thousand, one hundred thirty-nine".