3238721 has 16 divisors (see below), whose sum is σ = 3720960. Its totient is φ = 2799360.

The previous prime is 3238681. The next prime is 3238727. The reversal of 3238721 is 1278323.

It is a cyclic number.

It is not a de Polignac number, because 3238721 - 2¹⁴ = 3222337 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3238727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11816 + ... + 12086.

It is an arithmetic number, because the mean of its divisors is an integer number (232560).

Almost surely, 2^3238721 is an apocalyptic number.

It is an amenable number.

3238721 is a deficient number, since it is larger than the sum of its proper divisors (482239).

3238721 is a wasteful number, since it uses less digits than its factorization.

3238721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its digits is 2016, while the sum is 26.

The square root of 3238721 is about 1799.6446871536. The cubic root of 3238721 is about 147.9532510006.

The spelling of 3238721 in words is "three million, two hundred thirty-eight thousand, seven hundred twenty-one".