3978445 has 8 divisors (see below), whose sum is σ = 4864536. Its totient is φ = 3122496.

The previous prime is 3978433. The next prime is 3978451. The reversal of 3978445 is 5448793.

It can be written as a sum of positive squares in 4 ways, for example, as 1108809 + 2869636 = 1053^2 + 1694^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3978445 - 2⁹ = 3977933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3978398 and 3978407.

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 in 7 ways as a sum of consecutive naturals, for example, 7242 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (608067).

Almost surely, 2^3978445 is an apocalyptic number.

It is an amenable number.

3978445 is a deficient number, since it is larger than the sum of its proper divisors (886091).

3978445 is a wasteful number, since it uses less digits than its factorization.

3978445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15071.

The product of its digits is 120960, while the sum is 40.

The square root of 3978445 is about 1994.6039707170. The cubic root of 3978445 is about 158.4544545668.

The spelling of 3978445 in words is "three million, nine hundred seventy-eight thousand, four hundred forty-five".