442821269 has 16 divisors (see below), whose sum is σ = 490432320. Its totient is φ = 396480000.

The previous prime is 442821259. The next prime is 442821283. The reversal of 442821269 is 962128244.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442821269 is a prime.

It is a super-2 number, since 2×442821269² = 392181352557540722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442821209) 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, 233477 + ... + 235365.

It is an arithmetic number, because the mean of its divisors is an integer number (30652020).

Almost surely, 2^442821269 is an apocalyptic number.

It is an amenable number.

442821269 is a deficient number, since it is larger than the sum of its proper divisors (47611051).

442821269 is a wasteful number, since it uses less digits than its factorization.

442821269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212.

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

The square root of 442821269 is about 21043.3188684675. The cubic root of 442821269 is about 762.2126590525.

The spelling of 442821269 in words is "four hundred forty-two million, eight hundred twenty-one thousand, two hundred sixty-nine".