3240721 has 8 divisors (see below), whose sum is σ = 3657600. Its totient is φ = 2844240.

The previous prime is 3240707. The next prime is 3240733. The reversal of 3240721 is 1270423.

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 3240721 - 2¹³ = 3232529 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 (3240701) 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, 4761 + ... + 5398.

It is an arithmetic number, because the mean of its divisors is an integer number (457200).

Almost surely, 2^3240721 is an apocalyptic number.

It is an amenable number.

3240721 is a deficient number, since it is larger than the sum of its proper divisors (416879).

3240721 is a wasteful number, since it uses less digits than its factorization.

3240721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 3240721 is about 1800.2002666370. The cubic root of 3240721 is about 147.9836998118.

The spelling of 3240721 in words is "three million, two hundred forty thousand, seven hundred twenty-one".