42187225 has 6 divisors (see below), whose sum is σ = 52312190. Its totient is φ = 33749760.

The previous prime is 42187207. The next prime is 42187253. The reversal of 42187225 is 52278124.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 11128896 + 31058329 = 3336^2 + 5573^2 .

It is not a de Polignac number, because 42187225 - 2²¹ = 40090073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 843720 + ... + 843769.

Almost surely, 2^42187225 is an apocalyptic number.

It is an amenable number.

42187225 is a deficient number, since it is larger than the sum of its proper divisors (10124965).

42187225 is a wasteful number, since it uses less digits than its factorization.

42187225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687499 (or 1687494 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 42187225 is about 6495.1693588389. The cubic root of 42187225 is about 348.1184061122.

The spelling of 42187225 in words is "forty-two million, one hundred eighty-seven thousand, two hundred twenty-five".