442432421 has 4 divisors (see below), whose sum is σ = 454390092. Its totient is φ = 430474752.

The previous prime is 442432411. The next prime is 442432427. The reversal of 442432421 is 124234244.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 376903396 + 65529025 = 19414^2 + 8095^2 .

It is a cyclic number.

It is not a de Polignac number, because 442432421 - 2¹⁸ = 442170277 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 (442432427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5978780 + ... + 5978853.

It is an arithmetic number, because the mean of its divisors is an integer number (113597523).

Almost surely, 2^442432421 is an apocalyptic number.

It is an amenable number.

442432421 is a deficient number, since it is larger than the sum of its proper divisors (11957671).

442432421 is a wasteful number, since it uses less digits than its factorization.

442432421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11957670.

The product of its digits is 6144, while the sum is 26.

The square root of 442432421 is about 21034.0776122938. The cubic root of 442432421 is about 761.9894902600.

Adding to 442432421 its reverse (124234244), we get a palindrome (566666665).

It can be divided in two parts, 44243 and 2421, that added together give a palindrome (46664).

The spelling of 442432421 in words is "four hundred forty-two million, four hundred thirty-two thousand, four hundred twenty-one".