42440540 has 48 divisors (see below), whose sum is σ = 91355040. Its totient is φ = 16558080.

The previous prime is 42440539. The next prime is 42440557. The reversal of 42440540 is 4504424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201035 + ... + 201245.

It is an arithmetic number, because the mean of its divisors is an integer number (1903230).

Almost surely, 2^42440540 is an apocalyptic number.

It is an amenable number.

42440540 is an abundant number, since it is smaller than the sum of its proper divisors (48914500).

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

42440540 is a wasteful number, since it uses less digits than its factorization.

42440540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 42440540 is about 6514.6404352044. The cubic root of 42440540 is about 348.8137801243.

Adding to 42440540 its reverse (4504424), we get a palindrome (46944964).

The spelling of 42440540 in words is "forty-two million, four hundred forty thousand, five hundred forty".