3978216 has 48 divisors (see below), whose sum is σ = 11756160. Its totient is φ = 1205280.

The previous prime is 3978197. The next prime is 3978217. The reversal of 3978216 is 6128793.

3978216 = 54² + 55² + ... + 229².

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978217) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1720 + ... + 3303.

It is an arithmetic number, because the mean of its divisors is an integer number (244920).

Almost surely, 2^3978216 is an apocalyptic number.

3978216 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3978216 is an abundant number, since it is smaller than the sum of its proper divisors (7777944).

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

3978216 is a wasteful number, since it uses less digits than its factorization.

3978216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046 (or 5039 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 3978216 is about 1994.5465650117. The cubic root of 3978216 is about 158.4514142863.

The spelling of 3978216 in words is "three million, nine hundred seventy-eight thousand, two hundred sixteen".