3978111 has 4 divisors (see below), whose sum is σ = 5304152. Its totient is φ = 2652072.

The previous prime is 3978109. The next prime is 3978113. The reversal of 3978111 is 1118793.

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

It is an interprime number because it is at equal distance from previous prime (3978109) and next prime (3978113).

It is not a de Polignac number, because 3978111 - 2¹ = 3978109 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663016 + ... + 663021.

It is an arithmetic number, because the mean of its divisors is an integer number (1326038).

Almost surely, 2^3978111 is an apocalyptic number.

3978111 is a deficient number, since it is larger than the sum of its proper divisors (1326041).

3978111 is a wasteful number, since it uses less digits than its factorization.

3978111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326040.

The product of its digits is 1512, while the sum is 30.

The square root of 3978111 is about 1994.5202430660. The cubic root of 3978111 is about 158.4500202322.

The spelling of 3978111 in words is "three million, nine hundred seventy-eight thousand, one hundred eleven".