442343421 has 24 divisors (see below), whose sum is σ = 692240640. Its totient is φ = 270569376.

The previous prime is 442343401. The next prime is 442343423. The reversal of 442343421 is 124343244.

It is a happy number.

442343421 is a `hidden beast` number, since 4 + 4 + 234 + 3 + 421 = 666.

It is not a de Polignac number, because 442343421 - 2¹⁴ = 442327037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442343423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8220 + ... + 30858.

It is an arithmetic number, because the mean of its divisors is an integer number (28843360).

Almost surely, 2^442343421 is an apocalyptic number.

It is an amenable number.

442343421 is a deficient number, since it is larger than the sum of its proper divisors (249897219).

442343421 is a wasteful number, since it uses less digits than its factorization.

442343421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22825 (or 22822 counting only the distinct ones).

The product of its digits is 9216, while the sum is 27.

The square root of 442343421 is about 21031.9618913691. The cubic root of 442343421 is about 761.9383927293.

Adding to 442343421 its reverse (124343244), we get a palindrome (566686665).

The spelling of 442343421 in words is "four hundred forty-two million, three hundred forty-three thousand, four hundred twenty-one".