42445240 has 32 divisors (see below), whose sum is σ = 100530000. Its totient is φ = 16084224.

The previous prime is 42445223. The next prime is 42445279. The reversal of 42445240 is 4254424.

It is a happy number.

42445240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27165 + ... + 28684.

Almost surely, 2^42445240 is an apocalyptic number.

42445240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42445240 is an abundant number, since it is smaller than the sum of its proper divisors (58084760).

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

42445240 is a wasteful number, since it uses less digits than its factorization.

42445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55879 (or 55875 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 42445240 is about 6515.0011511895. The cubic root of 42445240 is about 348.8266558971.

Adding to 42445240 its reverse (4254424), we get a palindrome (46699664).

The spelling of 42445240 in words is "forty-two million, four hundred forty-five thousand, two hundred forty".