3287721 has 4 divisors (see below), whose sum is σ = 4383632. Its totient is φ = 2191812.

The previous prime is 3287719. The next prime is 3287747. The reversal of 3287721 is 1277823.

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 not a de Polignac number, because 3287721 - 2¹ = 3287719 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3287761) 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, 547951 + ... + 547956.

It is an arithmetic number, because the mean of its divisors is an integer number (1095908).

Almost surely, 2^3287721 is an apocalyptic number.

It is an amenable number.

3287721 is a deficient number, since it is larger than the sum of its proper divisors (1095911).

3287721 is a wasteful number, since it uses less digits than its factorization.

3287721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095910.

The product of its digits is 4704, while the sum is 30.

The square root of 3287721 is about 1813.2073792040. The cubic root of 3287721 is about 148.6956687862.

The spelling of 3287721 in words is "three million, two hundred eighty-seven thousand, seven hundred twenty-one".