3972856 has 16 divisors (see below), whose sum is σ = 7623000. Its totient is φ = 1940064.

The previous prime is 3972851. The next prime is 3972877. The reversal of 3972856 is 6582793.

It is a d-powerful number, because it can be written as 3¹¹ + 9² + 7⁵ + 2¹¹ + 8⁷ + 5 + 6⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972851) 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, 5431 + ... + 6118.

Almost surely, 2^3972856 is an apocalyptic number.

It is an amenable number.

3972856 is a deficient number, since it is larger than the sum of its proper divisors (3650144).

3972856 is a wasteful number, since it uses less digits than its factorization.

3972856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11598 (or 11594 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 3972856 is about 1993.2024483228. The cubic root of 3972856 is about 158.3802197863.

The spelling of 3972856 in words is "three million, nine hundred seventy-two thousand, eight hundred fifty-six".