19439221 has 8 divisors (see below), whose sum is σ = 19720800. Its totient is φ = 19159920.

The previous prime is 19439191. The next prime is 19439227. The reversal of 19439221 is 12293491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19439221 - 2¹⁹ = 18914933 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 (19439227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23035 + ... + 23863.

It is an arithmetic number, because the mean of its divisors is an integer number (2465100).

Almost surely, 2^19439221 is an apocalyptic number.

It is an amenable number.

19439221 is a deficient number, since it is larger than the sum of its proper divisors (281579).

19439221 is a wasteful number, since it uses less digits than its factorization.

19439221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its digits is 3888, while the sum is 31.

The square root of 19439221 is about 4408.9931957307. The cubic root of 19439221 is about 268.8806931670.

The spelling of 19439221 in words is "nineteen million, four hundred thirty-nine thousand, two hundred twenty-one".