42540225 has 96 divisors (see below), whose sum is σ = 90660864. Its totient is φ = 17107200.

The previous prime is 42540191. The next prime is 42540227. The reversal of 42540225 is 52204524.

It is a happy number.

It is not a de Polignac number, because 42540225 - 2⁸ = 42539969 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42540195 and 42540204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 156840 + ... + 157110.

It is an arithmetic number, because the mean of its divisors is an integer number (944384).

Almost surely, 2^42540225 is an apocalyptic number.

It is an amenable number.

42540225 is an abundant number, since it is smaller than the sum of its proper divisors (48120639).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42540225 is a wasteful number, since it uses less digits than its factorization.

42540225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 42540225 is about 6522.2867922225. The cubic root of 42540225 is about 349.0866663253.

Adding to 42540225 its reverse (52204524), we get a palindrome (94744749).

The spelling of 42540225 in words is "forty-two million, five hundred forty thousand, two hundred twenty-five".