3978243 has 6 divisors (see below), whose sum is σ = 5746364. Its totient is φ = 2652156.

The previous prime is 3978229. The next prime is 3978253. The reversal of 3978243 is 3428793.

It is not a de Polignac number, because 3978243 - 2⁶ = 3978179 is a prime.

It is a Duffinian number.

3978243 is a lucky number.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 3978198 and 3978207.

It is not an unprimeable number, because it can be changed into a prime (3978253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221005 + ... + 221022.

Almost surely, 2^3978243 is an apocalyptic number.

3978243 is a deficient number, since it is larger than the sum of its proper divisors (1768121).

3978243 is a wasteful number, since it uses less digits than its factorization.

3978243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442033 (or 442030 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 3978243 is about 1994.5533334559. The cubic root of 3978243 is about 158.4517727534.

The spelling of 3978243 in words is "three million, nine hundred seventy-eight thousand, two hundred forty-three".