3999078 has 32 divisors (see below), whose sum is σ = 8985600. Its totient is φ = 1318248.

The previous prime is 3999067. The next prime is 3999109. The reversal of 3999078 is 8709993.

It is a happy number.

3999078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5203 + ... + 5921.

It is an arithmetic number, because the mean of its divisors is an integer number (280800).

Almost surely, 2^3999078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3999078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4492800).

3999078 is an abundant number, since it is smaller than the sum of its proper divisors (4986522).

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

3999078 is a wasteful number, since it uses less digits than its factorization.

3999078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 3999078 is about 1999.7694867159. The cubic root of 3999078 is about 158.7279077282.

Subtracting 3999078 from its reverse (8709993), we obtain a triangular number (4710915 = T₃₀₆₉).

The spelling of 3999078 in words is "three million, nine hundred ninety-nine thousand, seventy-eight".