3978906 has 16 divisors (see below), whose sum is σ = 8173344. Its totient is φ = 1290384.

The previous prime is 3978899. The next prime is 3978917. The reversal of 3978906 is 6098793.

It is a happy number.

It is an Ulam 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, 8740 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (510834).

Almost surely, 2^3978906 is an apocalyptic number.

3978906 is an abundant number, since it is smaller than the sum of its proper divisors (4194438).

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

3978906 is a wasteful number, since it uses less digits than its factorization.

3978906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17965.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 3978906 is about 1994.7195291569. The cubic root of 3978906 is about 158.4605746030.

It can be divided in two parts, 3978 and 906, that added together give a palindrome (4884).

The spelling of 3978906 in words is "three million, nine hundred seventy-eight thousand, nine hundred six".