3849721 has 4 divisors (see below), whose sum is σ = 3982500. Its totient is φ = 3716944.

The previous prime is 3849707. The next prime is 3849737. The reversal of 3849721 is 1279483.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2595321 + 1254400 = 1611^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 3849721 - 2¹¹ = 3847673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3849421) 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, 66346 + ... + 66403.

It is an arithmetic number, because the mean of its divisors is an integer number (995625).

Almost surely, 2^3849721 is an apocalyptic number.

It is an amenable number.

3849721 is a deficient number, since it is larger than the sum of its proper divisors (132779).

3849721 is a wasteful number, since it uses less digits than its factorization.

3849721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132778.

The product of its digits is 12096, while the sum is 34.

The square root of 3849721 is about 1962.0705899636. The cubic root of 3849721 is about 156.7267346746.

The spelling of 3849721 in words is "three million, eight hundred forty-nine thousand, seven hundred twenty-one".