3971778 has 32 divisors (see below), whose sum is σ = 8781696. Its totient is φ = 1191168.

The previous prime is 3971749. The next prime is 3971791. The reversal of 3971778 is 8771793.

It is a happy number.

3971778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon 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, 1500 + ... + 3192.

It is an arithmetic number, because the mean of its divisors is an integer number (274428).

Almost surely, 2^3971778 is an apocalyptic number.

3971778 is an abundant number, since it is smaller than the sum of its proper divisors (4809918).

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

3971778 is a wasteful number, since it uses less digits than its factorization.

3971778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738.

The product of its digits is 74088, while the sum is 42.

The square root of 3971778 is about 1992.9320108825. The cubic root of 3971778 is about 158.3658934577.

It can be divided in two parts, 39 and 71778, that added together give a palindrome (71817).

The spelling of 3971778 in words is "three million, nine hundred seventy-one thousand, seven hundred seventy-eight".