3153721 has 8 divisors (see below), whose sum is σ = 3454920. Its totient is φ = 2865408.

The previous prime is 3153719. The next prime is 3153739. The reversal of 3153721 is 1273513.

3153721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 129600 + 3024121 = 360^2 + 1739^2 .

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 3153721 - 2¹ = 3153719 is a prime.

It is a super-2 number, since 2×3153721² = 19891912291682, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3153692 and 3153701.

It is not an unprimeable number, because it can be changed into a prime (3153121) 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, 2706 + ... + 3691.

It is an arithmetic number, because the mean of its divisors is an integer number (431865).

Almost surely, 2^3153721 is an apocalyptic number.

It is an amenable number.

3153721 is a deficient number, since it is larger than the sum of its proper divisors (301199).

3153721 is a wasteful number, since it uses less digits than its factorization.

3153721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6443.

The product of its digits is 630, while the sum is 22.

The square root of 3153721 is about 1775.8718985332. The cubic root of 3153721 is about 146.6474188469.

The spelling of 3153721 in words is "three million, one hundred fifty-three thousand, seven hundred twenty-one".