3843721 has 8 divisors (see below), whose sum is σ = 4534784. Its totient is φ = 3188160.

The previous prime is 3843713. The next prime is 3843731. The reversal of 3843721 is 1273483.

3843721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3843721 - 2³ = 3843713 is a prime.

It is a super-2 number, since 2×3843721² = 29548382251682, which contains 22 as substring.

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 3843721.

It is not an unprimeable number, because it can be changed into a prime (3843701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8640 + ... + 9073.

It is an arithmetic number, because the mean of its divisors is an integer number (566848).

Almost surely, 2^3843721 is an apocalyptic number.

3843721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3843721 is a deficient number, since it is larger than the sum of its proper divisors (691063).

3843721 is a wasteful number, since it uses less digits than its factorization.

3843721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17751.

The product of its digits is 4032, while the sum is 28.

The square root of 3843721 is about 1960.5409967659. The cubic root of 3843721 is about 156.6452699515.

The spelling of 3843721 in words is "three million, eight hundred forty-three thousand, seven hundred twenty-one".