42215125 has 8 divisors (see below), whose sum is σ = 52684632. Its totient is φ = 33772000.

The previous prime is 42215123. The next prime is 42215137. The reversal of 42215125 is 52151224.

It can be written as a sum of positive squares in 4 ways, for example, as 133956 + 42081169 = 366^2 + 6487^2 .

It is not a de Polignac number, because 42215125 - 2¹ = 42215123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42215096 and 42215105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42215123) 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 7 ways as a sum of consecutive naturals, for example, 168736 + ... + 168985.

It is an arithmetic number, because the mean of its divisors is an integer number (6585579).

Almost surely, 2^42215125 is an apocalyptic number.

It is an amenable number.

42215125 is a deficient number, since it is larger than the sum of its proper divisors (10469507).

42215125 is an equidigital number, since it uses as much as digits as its factorization.

42215125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337736 (or 337726 counting only the distinct ones).

The product of its digits is 800, while the sum is 22.

The square root of 42215125 is about 6497.3167538608. The cubic root of 42215125 is about 348.1951304700.

Adding to 42215125 its reverse (52151224), we get a palindrome (94366349).

The spelling of 42215125 in words is "forty-two million, two hundred fifteen thousand, one hundred twenty-five".