3978138 has 16 divisors (see below), whose sum is σ = 7989696. Its totient is φ = 1320480.

The previous prime is 3978113. The next prime is 3978167. The reversal of 3978138 is 8318793.

3978138 = T₄₅₂ + T₄₅₃ + ... + T₄₈₇.

It is a junction number, because it is equal to n+sod(n) for n = 3978096 and 3978105.

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, 318 + ... + 2838.

It is an arithmetic number, because the mean of its divisors is an integer number (499356).

Almost surely, 2^3978138 is an apocalyptic number.

3978138 is an abundant number, since it is smaller than the sum of its proper divisors (4011558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3978138 is a wasteful number, since it uses less digits than its factorization.

3978138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789.

The product of its digits is 36288, while the sum is 39.

The square root of 3978138 is about 1994.5270115995. The cubic root of 3978138 is about 158.4503787056.

The spelling of 3978138 in words is "three million, nine hundred seventy-eight thousand, one hundred thirty-eight".