3938800078 has 4 divisors (see below), whose sum is σ = 5908200120. Its totient is φ = 1969400038.

The previous prime is 3938800051. The next prime is 3938800081. The reversal of 3938800078 is 8700088393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8700088393 = 9649 ⋅901657.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984700018 + ... + 984700021.

It is an arithmetic number, because the mean of its divisors is an integer number (1477050030).

Almost surely, 2^3938800078 is an apocalyptic number.

3938800078 is a deficient number, since it is larger than the sum of its proper divisors (1969400042).

3938800078 is a wasteful number, since it uses less digits than its factorization.

3938800078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969400041.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 3938800078 is about 62759.8604045611. The cubic root of 3938800078 is about 1579.2636741556.

The spelling of 3938800078 in words is "three billion, nine hundred thirty-eight million, eight hundred thousand, seventy-eight".