42238457 has 4 divisors (see below), whose sum is σ = 42817140. Its totient is φ = 41659776.

The previous prime is 42238453. The next prime is 42238459. The reversal of 42238457 is 75483224.

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 15808576 + 26429881 = 3976^2 + 5141^2 .

It is a cyclic number.

It is not a de Polignac number, because 42238457 - 2² = 42238453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42238453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289232 + ... + 289377.

It is an arithmetic number, because the mean of its divisors is an integer number (10704285).

Almost surely, 2^42238457 is an apocalyptic number.

It is an amenable number.

42238457 is a deficient number, since it is larger than the sum of its proper divisors (578683).

42238457 is an equidigital number, since it uses as much as digits as its factorization.

42238457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578682.

The product of its digits is 53760, while the sum is 35.

The square root of 42238457 is about 6499.1120162681. The cubic root of 42238457 is about 348.2592669814.

The spelling of 42238457 in words is "forty-two million, two hundred thirty-eight thousand, four hundred fifty-seven".