442123231 has 6 divisors (see below), whose sum is σ = 485970296. Its totient is φ = 401930100.

The previous prime is 442123223. The next prime is 442123237. The reversal of 442123231 is 132321244.

It is not a de Polignac number, because 442123231 - 2³ = 442123223 is a prime.

It is a super-2 number, since 2×442123231² = 390945902779758722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442123237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1826835 + ... + 1827076.

Almost surely, 2^442123231 is an apocalyptic number.

442123231 is a deficient number, since it is larger than the sum of its proper divisors (43847065).

442123231 is a wasteful number, since it uses less digits than its factorization.

442123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653933 (or 3653922 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 442123231 is about 21026.7265878453. The cubic root of 442123231 is about 761.8119456808.

Adding to 442123231 its reverse (132321244), we get a palindrome (574444475).

The spelling of 442123231 in words is "four hundred forty-two million, one hundred twenty-three thousand, two hundred thirty-one".