3978849 has 12 divisors (see below), whose sum is σ = 6171504. Its totient is φ = 2273544.

The previous prime is 3978841. The next prime is 3978859. The reversal of 3978849 is 9488793.

3978849 = 151² + 152² + ... + 248².

It is not a de Polignac number, because 3978849 - 2³ = 3978841 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3978798 and 3978807.

It is not an unprimeable number, because it can be changed into a prime (3978841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13387 + ... + 13680.

It is an arithmetic number, because the mean of its divisors is an integer number (514292).

Almost surely, 2^3978849 is an apocalyptic number.

It is an amenable number.

3978849 is a deficient number, since it is larger than the sum of its proper divisors (2192655).

3978849 is a wasteful number, since it uses less digits than its factorization.

3978849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27084 (or 27077 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 3978849 is about 1994.7052413828. The cubic root of 3978849 is about 158.4598179213.

The spelling of 3978849 in words is "three million, nine hundred seventy-eight thousand, eight hundred forty-nine".