3938686 has 4 divisors (see below), whose sum is σ = 5908032. Its totient is φ = 1969342.

The previous prime is 3938657. The next prime is 3938699. The reversal of 3938686 is 6868393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6868393 = 7 ⋅981199.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 984670 + ... + 984673.

It is an arithmetic number, because the mean of its divisors is an integer number (1477008).

Almost surely, 2^3938686 is an apocalyptic number.

3938686 is a deficient number, since it is larger than the sum of its proper divisors (1969346).

3938686 is a wasteful number, since it uses less digits than its factorization.

3938686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969345.

The product of its digits is 186624, while the sum is 43.

The square root of 3938686 is about 1984.6123047084. The cubic root of 3938686 is about 157.9248427466.

It can be divided in two parts, 3938 and 686, that added together give a square (4624 = 68²).

The spelling of 3938686 in words is "three million, nine hundred thirty-eight thousand, six hundred eighty-six".