442689221 has 8 divisors (see below), whose sum is σ = 481117560. Its totient is φ = 404885952.

The previous prime is 442689179. The next prime is 442689223. The reversal of 442689221 is 122986244.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11296321 + 431392900 = 3361^2 + 20770^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442689221 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 (442689223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154790 + ... + 157623.

It is an arithmetic number, because the mean of its divisors is an integer number (60139695).

Almost surely, 2^442689221 is an apocalyptic number.

It is an amenable number.

442689221 is a deficient number, since it is larger than the sum of its proper divisors (38428339).

442689221 is a wasteful number, since it uses less digits than its factorization.

442689221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312535.

The product of its digits is 55296, while the sum is 38.

The square root of 442689221 is about 21040.1811066350. The cubic root of 442689221 is about 762.1368883294.

The spelling of 442689221 in words is "four hundred forty-two million, six hundred eighty-nine thousand, two hundred twenty-one".