442138251 has 8 divisors (see below), whose sum is σ = 589725504. Its totient is φ = 294654920.

The previous prime is 442138211. The next prime is 442138253. The reversal of 442138251 is 152831244.

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

It is a cyclic number.

It is not a de Polignac number, because 442138251 - 2¹¹ = 442136203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (442138253) 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 7 ways as a sum of consecutive naturals, for example, 15441 + ... + 33506.

It is an arithmetic number, because the mean of its divisors is an integer number (73715688).

Almost surely, 2^442138251 is an apocalyptic number.

442138251 is a deficient number, since it is larger than the sum of its proper divisors (147587253).

442138251 is a wasteful number, since it uses less digits than its factorization.

442138251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51961.

The product of its digits is 7680, while the sum is 30.

The square root of 442138251 is about 21027.0837492982. The cubic root of 442138251 is about 761.8205724504.

Adding to 442138251 its reverse (152831244), we get a palindrome (594969495).

The spelling of 442138251 in words is "four hundred forty-two million, one hundred thirty-eight thousand, two hundred fifty-one".