3221639 has 4 divisors (see below), whose sum is σ = 3332760. Its totient is φ = 3110520.

The previous prime is 3221629. The next prime is 3221641. The reversal of 3221639 is 9361223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9361223 = 149 ⋅62827.

It is a cyclic number.

It is not a de Polignac number, because 3221639 - 2¹⁶ = 3156103 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 (3221629) 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, 55517 + ... + 55574.

It is an arithmetic number, because the mean of its divisors is an integer number (833190).

Almost surely, 2^3221639 is an apocalyptic number.

3221639 is a deficient number, since it is larger than the sum of its proper divisors (111121).

3221639 is a wasteful number, since it uses less digits than its factorization.

3221639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111120.

The product of its digits is 1944, while the sum is 26.

The square root of 3221639 is about 1794.8924758882. The cubic root of 3221639 is about 147.6926755230.

The spelling of 3221639 in words is "three million, two hundred twenty-one thousand, six hundred thirty-nine".