3978908 has 24 divisors (see below), whose sum is σ = 7395360. Its totient is φ = 1869120.

The previous prime is 3978899. The next prime is 3978917. The reversal of 3978908 is 8098793.

It is an interprime number because it is at equal distance from previous prime (3978899) and next prime (3978917).

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 5258 + ... + 5966.

It is an arithmetic number, because the mean of its divisors is an integer number (308140).

Almost surely, 2^3978908 is an apocalyptic number.

It is an amenable number.

3978908 is a deficient number, since it is larger than the sum of its proper divisors (3416452).

3978908 is a wasteful number, since it uses less digits than its factorization.

3978908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 3978908 is about 1994.7200304805. The cubic root of 3978908 is about 158.4606011531.

Subtracting 3978908 from its reverse (8098793), we obtain a triangular number (4119885 = T₂₈₇₀).

The spelling of 3978908 in words is "three million, nine hundred seventy-eight thousand, nine hundred eight".