3245721 has 4 divisors (see below), whose sum is σ = 4327632. Its totient is φ = 2163812.

The previous prime is 3245707. The next prime is 3245729. The reversal of 3245721 is 1275423.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3245721 - 2⁵ = 3245689 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 3245691 and 3245700.

It is not an unprimeable number, because it can be changed into a prime (3245729) 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, 540951 + ... + 540956.

It is an arithmetic number, because the mean of its divisors is an integer number (1081908).

Almost surely, 2^3245721 is an apocalyptic number.

It is an amenable number.

3245721 is a deficient number, since it is larger than the sum of its proper divisors (1081911).

3245721 is a wasteful number, since it uses less digits than its factorization.

3245721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081910.

The product of its digits is 1680, while the sum is 24.

The square root of 3245721 is about 1801.5884657712. The cubic root of 3245721 is about 148.0597670711.

It can be divided in two parts, 32 and 45721, that added together give a triangular number (45753 = T₃₀₂).

The spelling of 3245721 in words is "three million, two hundred forty-five thousand, seven hundred twenty-one".