3866720 has 96 divisors (see below), whose sum is σ = 10795680. Its totient is φ = 1297920.

The previous prime is 3866719. The next prime is 3866741. The reversal of 3866720 is 276683.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an Ulam number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 297434 + ... + 297446.

It is an arithmetic number, because the mean of its divisors is an integer number (112455).

Almost surely, 2^3866720 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 3866720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5397840).

3866720 is an abundant number, since it is smaller than the sum of its proper divisors (6928960).

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

3866720 is a wasteful number, since it uses less digits than its factorization.

3866720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 3866720 is about 1966.3977217237. The cubic root of 3866720 is about 156.9570791567.

The spelling of 3866720 in words is "three million, eight hundred sixty-six thousand, seven hundred twenty".