3847978 has 4 divisors (see below), whose sum is σ = 5771970. Its totient is φ = 1923988.

The previous prime is 3847939. The next prime is 3848017. The reversal of 3847978 is 8797483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8797483 = 17 ⋅517499.

It is an interprime number because it is at equal distance from previous prime (3847939) and next prime (3848017).

It can be written as a sum of positive squares in only one way, i.e., 2518569 + 1329409 = 1587^2 + 1153^2 .

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 as a sum of consecutive naturals, namely, 961993 + ... + 961996.

Almost surely, 2^3847978 is an apocalyptic number.

3847978 is a deficient number, since it is larger than the sum of its proper divisors (1923992).

3847978 is a wasteful number, since it uses less digits than its factorization.

3847978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923991.

The product of its digits is 338688, while the sum is 46.

The square root of 3847978 is about 1961.6263660545. The cubic root of 3847978 is about 156.7030779008.

The spelling of 3847978 in words is "three million, eight hundred forty-seven thousand, nine hundred seventy-eight".