3977216 has 26 divisors (see below), whose sum is σ = 7961652. Its totient is φ = 1986560.

The previous prime is 3977209. The next prime is 3977219. The reversal of 3977216 is 6127793.

It is a super-2 number, since 2×3977216² = 31636494221312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3977219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3611 + ... + 4581.

Almost surely, 2^3977216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3977216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3980826).

3977216 is an abundant number, since it is smaller than the sum of its proper divisors (3984436).

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

3977216 is an frugal number, since it uses more digits than its factorization.

3977216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995 (or 973 counting only the distinct ones).

The product of its digits is 15876, while the sum is 35.

The square root of 3977216 is about 1994.2958657130. The cubic root of 3977216 is about 158.4381365849.

The spelling of 3977216 in words is "three million, nine hundred seventy-seven thousand, two hundred sixteen".