42002225 has 6 divisors (see below), whose sum is σ = 52082790. Its totient is φ = 33601760.

The previous prime is 42002201. The next prime is 42002227. The reversal of 42002225 is 52220024.

It can be written as a sum of positive squares in 3 ways, for example, as 734449 + 41267776 = 857^2 + 6424^2 .

It is not a de Polignac number, because 42002225 - 2⁸ = 42001969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42002227) 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 5 ways as a sum of consecutive naturals, for example, 840020 + ... + 840069.

It is an arithmetic number, because the mean of its divisors is an integer number (8680465).

Almost surely, 2^42002225 is an apocalyptic number.

It is an amenable number.

42002225 is a deficient number, since it is larger than the sum of its proper divisors (10080565).

42002225 is a wasteful number, since it uses less digits than its factorization.

42002225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680099 (or 1680094 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 42002225 is about 6480.9123586112. The cubic root of 42002225 is about 347.6088026019.

Adding to 42002225 its reverse (52220024), we get a palindrome (94222249).

It can be divided in two parts, 4 and 2002225, that multiplied together give a square (8008900 = 2830²).

The spelling of 42002225 in words is "forty-two million, two thousand, two hundred twenty-five".