3515721 has 8 divisors (see below), whose sum is σ = 5113824. Its totient is φ = 2130720.

The previous prime is 3515717. The next prime is 3515731. The reversal of 3515721 is 1275153.

3515721 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 not a de Polignac number, because 3515721 - 2² = 3515717 is a prime.

3515721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3515691 and 3515700.

It is not an unprimeable number, because it can be changed into a prime (3515731) 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, 53236 + ... + 53301.

It is an arithmetic number, because the mean of its divisors is an integer number (639228).

Almost surely, 2^3515721 is an apocalyptic number.

It is an amenable number.

3515721 is a deficient number, since it is larger than the sum of its proper divisors (1598103).

3515721 is a wasteful number, since it uses less digits than its factorization.

3515721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106551.

The product of its digits is 1050, while the sum is 24.

The square root of 3515721 is about 1875.0255998252. The cubic root of 3515721 is about 152.0564339156.

The spelling of 3515721 in words is "three million, five hundred fifteen thousand, seven hundred twenty-one".