3939994 has 4 divisors (see below), whose sum is σ = 5909994. Its totient is φ = 1969996.

The previous prime is 3939989. The next prime is 3939997. The reversal of 3939994 is 4999393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4999393 = 7 ⋅714199.

It can be written as a sum of positive squares in only one way, i.e., 3470769 + 469225 = 1863^2 + 685^2 .

It is not an unprimeable number, because it can be changed into a prime (3939997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984997 + ... + 985000.

Almost surely, 2^3939994 is an apocalyptic number.

3939994 is a deficient number, since it is larger than the sum of its proper divisors (1970000).

3939994 is a wasteful number, since it uses less digits than its factorization.

3939994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969999.

The product of its digits is 236196, while the sum is 46.

The square root of 3939994 is about 1984.9418127492. The cubic root of 3939994 is about 157.9423225891.

It can be divided in two parts, 39399 and 94, that added together give a palindrome (39493).

The spelling of 3939994 in words is "three million, nine hundred thirty-nine thousand, nine hundred ninety-four".