3239721 has 12 divisors (see below), whose sum is σ = 4708080. Its totient is φ = 2146680.

The previous prime is 3239713. The next prime is 3239723. The reversal of 3239721 is 1279323.

It is not a de Polignac number, because 3239721 - 2³ = 3239713 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3239723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 606 + ... + 2616.

It is an arithmetic number, because the mean of its divisors is an integer number (392340).

Almost surely, 2^3239721 is an apocalyptic number.

It is an amenable number.

3239721 is a deficient number, since it is larger than the sum of its proper divisors (1468359).

3239721 is a wasteful number, since it uses less digits than its factorization.

3239721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2193 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 3239721 is about 1799.9224983315. The cubic root of 3239721 is about 147.9684769727.

The spelling of 3239721 in words is "three million, two hundred thirty-nine thousand, seven hundred twenty-one".