3940078 has 4 divisors (see below), whose sum is σ = 5910120. Its totient is φ = 1970038.

The previous prime is 3940063. The next prime is 3940091. The reversal of 3940078 is 8700493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8700493 = 29 ⋅300017.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985018 + ... + 985021.

It is an arithmetic number, because the mean of its divisors is an integer number (1477530).

Almost surely, 2^3940078 is an apocalyptic number.

3940078 is a deficient number, since it is larger than the sum of its proper divisors (1970042).

3940078 is a wasteful number, since it uses less digits than its factorization.

3940078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970041.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3940078 is about 1984.9629719468. The cubic root of 3940078 is about 157.9434450156.

The spelling of 3940078 in words is "three million, nine hundred forty thousand, seventy-eight".