3978365 has 8 divisors (see below), whose sum is σ = 4938840. Its totient is φ = 3072832.

The previous prime is 3978349. The next prime is 3978421. The reversal of 3978365 is 5638793.

It can be written as a sum of positive squares in 4 ways, for example, as 466489 + 3511876 = 683^2 + 1874^2 .

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 3978365 - 2⁴ = 3978349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13574 + ... + 13863.

It is an arithmetic number, because the mean of its divisors is an integer number (617355).

Almost surely, 2^3978365 is an apocalyptic number.

It is an amenable number.

3978365 is a deficient number, since it is larger than the sum of its proper divisors (960475).

3978365 is a wasteful number, since it uses less digits than its factorization.

3978365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27471.

The product of its digits is 136080, while the sum is 41.

The square root of 3978365 is about 1994.5839165099. The cubic root of 3978365 is about 158.4533924734.

The spelling of 3978365 in words is "three million, nine hundred seventy-eight thousand, three hundred sixty-five".