3721856 has 16 divisors (see below), whose sum is σ = 7414890. Its totient is φ = 1860864.

The previous prime is 3721849. The next prime is 3721859. The reversal of 3721856 is 6581273.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2689600 + 1032256 = 1640^2 + 1016^2 .

It is a tau number, because it is divible by the number of its divisors (16).

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

It is not an unprimeable number, because it can be changed into a prime (3721859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14411 + ... + 14666.

Almost surely, 2^3721856 is an apocalyptic number.

It is an amenable number.

3721856 is a deficient number, since it is larger than the sum of its proper divisors (3693034).

3721856 is an equidigital number, since it uses as much as digits as its factorization.

3721856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29091 (or 29079 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 3721856 is about 1929.2112377861. The cubic root of 3721856 is about 154.9719824489.

The spelling of 3721856 in words is "three million, seven hundred twenty-one thousand, eight hundred fifty-six".