3971878 has 4 divisors (see below), whose sum is σ = 5957820. Its totient is φ = 1985938.

The previous prime is 3971861. The next prime is 3971879. The reversal of 3971878 is 8781793.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992968 + ... + 992971.

It is an arithmetic number, because the mean of its divisors is an integer number (1489455).

Almost surely, 2^3971878 is an apocalyptic number.

3971878 is a deficient number, since it is larger than the sum of its proper divisors (1985942).

3971878 is a wasteful number, since it uses less digits than its factorization.

3971878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985941.

The product of its digits is 84672, while the sum is 43.

The square root of 3971878 is about 1992.9570993877. The cubic root of 3971878 is about 158.3672225397.

It can be divided in two parts, 39 and 71878, that added together give a palindrome (71917).

The spelling of 3971878 in words is "three million, nine hundred seventy-one thousand, eight hundred seventy-eight".