2003978 has 4 divisors (see below), whose sum is σ = 3005970. Its totient is φ = 1001988.

The previous prime is 2003971. The next prime is 2003999. The reversal of 2003978 is 8793002.

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., 1760929 + 243049 = 1327^2 + 493^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2003978.

It is not an unprimeable number, because it can be changed into a prime (2003971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500993 + ... + 500996.

2^2003978 is an apocalyptic number.

2003978 is a deficient number, since it is larger than the sum of its proper divisors (1001992).

2003978 is a wasteful number, since it uses less digits than its factorization.

2003978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001991.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2003978 is about 1415.6192991055. The cubic root of 2003978 is about 126.0755824340.

Adding to 2003978 its product of nonzero digits (3024), we get a palindrome (2007002).

The spelling of 2003978 in words is "two million, three thousand, nine hundred seventy-eight".