3939778 has 4 divisors (see below), whose sum is σ = 5909670. Its totient is φ = 1969888.

The previous prime is 3939773. The next prime is 3939779. The reversal of 3939778 is 8779393.

3939778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 3508129 + 431649 = 1873^2 + 657^2 .

It is not an unprimeable number, because it can be changed into a prime (3939773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984943 + ... + 984946.

Almost surely, 2^3939778 is an apocalyptic number.

3939778 is a deficient number, since it is larger than the sum of its proper divisors (1969892).

3939778 is a wasteful number, since it uses less digits than its factorization.

3939778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969891.

The product of its digits is 285768, while the sum is 46.

The square root of 3939778 is about 1984.8874023481. The cubic root of 3939778 is about 157.9394362763.

The spelling of 3939778 in words is "three million, nine hundred thirty-nine thousand, seven hundred seventy-eight".