3978245 has 4 divisors (see below), whose sum is σ = 4773900. Its totient is φ = 3182592.

The previous prime is 3978229. The next prime is 3978253. The reversal of 3978245 is 5428793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1522756 + 2455489 = 1234^2 + 1567^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978245 - 2⁴ = 3978229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3978199 and 3978208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397820 + ... + 397829.

It is an arithmetic number, because the mean of its divisors is an integer number (1193475).

Almost surely, 2^3978245 is an apocalyptic number.

It is an amenable number.

3978245 is a deficient number, since it is larger than the sum of its proper divisors (795655).

3978245 is an equidigital number, since it uses as much as digits as its factorization.

3978245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795654.

The product of its digits is 60480, while the sum is 38.

The square root of 3978245 is about 1994.5538348212. The cubic root of 3978245 is about 158.4517993065.

The spelling of 3978245 in words is "three million, nine hundred seventy-eight thousand, two hundred forty-five".