42445820 has 48 divisors (see below), whose sum is σ = 92725248. Its totient is φ = 16303680.

The previous prime is 42445811. The next prime is 42445861. The reversal of 42445820 is 2854424.

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, 138107 + ... + 138413.

It is an arithmetic number, because the mean of its divisors is an integer number (1931776).

Almost surely, 2^42445820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42445820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46362624).

42445820 is an abundant number, since it is smaller than the sum of its proper divisors (50279428).

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

42445820 is a wasteful number, since it uses less digits than its factorization.

42445820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

The square root of 42445820 is about 6515.0456636926. The cubic root of 42445820 is about 348.8282447564.

The spelling of 42445820 in words is "forty-two million, four hundred forty-five thousand, eight hundred twenty".