42445040 has 80 divisors (see below), whose sum is σ = 108743040. Its totient is φ = 15279360.

The previous prime is 42445033. The next prime is 42445049. The reversal of 42445040 is 4054424.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 42444997 and 42445015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42445049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122147 + ... + 122493.

It is an arithmetic number, because the mean of its divisors is an integer number (1359288).

Almost surely, 2^42445040 is an apocalyptic number.

42445040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42445040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54371520).

42445040 is an abundant number, since it is smaller than the sum of its proper divisors (66298000).

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

42445040 is a wasteful number, since it uses less digits than its factorization.

42445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 504 counting only the distinct ones).

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

The square root of 42445040 is about 6514.9858019799. The cubic root of 42445040 is about 348.8261080112.

Adding to 42445040 its reverse (4054424), we get a palindrome (46499464).

The spelling of 42445040 in words is "forty-two million, four hundred forty-five thousand, forty".