42444225 has 72 divisors (see below), whose sum is σ = 80432352. Its totient is φ = 21369600.

The previous prime is 42444221. The next prime is 42444247. The reversal of 42444225 is 52244424.

It is not a de Polignac number, because 42444225 - 2² = 42444221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42444221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 396622 + ... + 396728.

It is an arithmetic number, because the mean of its divisors is an integer number (1117116).

Almost surely, 2^42444225 is an apocalyptic number.

42444225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42444225 is a deficient number, since it is larger than the sum of its proper divisors (37988127).

42444225 is a wasteful number, since it uses less digits than its factorization.

42444225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 199 counting only the distinct ones).

The product of its digits is 10240, while the sum is 27.

The square root of 42444225 is about 6514.9232535771. The cubic root of 42444225 is about 348.8238753585.

Adding to 42444225 its reverse (52244424), we get a palindrome (94688649).

The spelling of 42444225 in words is "forty-two million, four hundred forty-four thousand, two hundred twenty-five".