3963994 has 4 divisors (see below), whose sum is σ = 5945994. Its totient is φ = 1981996.

The previous prime is 3963991. The next prime is 3964007. The reversal of 3963994 is 4993693.

It is a happy number.

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., 3560769 + 403225 = 1887^2 + 635^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3963994.

It is not an unprimeable number, because it can be changed into a prime (3963991) 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 as a sum of consecutive naturals, namely, 990997 + ... + 991000.

Almost surely, 2^3963994 is an apocalyptic number.

3963994 is a deficient number, since it is larger than the sum of its proper divisors (1982000).

3963994 is a wasteful number, since it uses less digits than its factorization.

3963994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981999.

The product of its digits is 157464, while the sum is 43.

The square root of 3963994 is about 1990.9781515627. The cubic root of 3963994 is about 158.2623691839.

It can be divided in two parts, 3 and 963994, that multiplied together give a palindrome (2891982).

The spelling of 3963994 in words is "three million, nine hundred sixty-three thousand, nine hundred ninety-four".