3852721 has 8 divisors (see below), whose sum is σ = 3956040. Its totient is φ = 3750912.

The previous prime is 3852713. The next prime is 3852733. The reversal of 3852721 is 1272583.

It can be written as a sum of positive squares in 4 ways, for example, as 378225 + 3474496 = 615^2 + 1864^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3852721 - 2³ = 3852713 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3852721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3852781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6201 + ... + 6793.

It is an arithmetic number, because the mean of its divisors is an integer number (494505).

Almost surely, 2^3852721 is an apocalyptic number.

It is an amenable number.

3852721 is a deficient number, since it is larger than the sum of its proper divisors (103319).

3852721 is an equidigital number, since it uses as much as digits as its factorization.

3852721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755.

The product of its digits is 3360, while the sum is 28.

The square root of 3852721 is about 1962.8349395708. The cubic root of 3852721 is about 156.7674352971.

The spelling of 3852721 in words is "three million, eight hundred fifty-two thousand, seven hundred twenty-one".