42445940 has 48 divisors (see below), whose sum is σ = 95219712. Its totient is φ = 15837696.

The previous prime is 42445927. The next prime is 42445961. The reversal of 42445940 is 4954424.

42445940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 42445897 and 42445906.

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 15 ways as a sum of consecutive naturals, for example, 42689 + ... + 43671.

It is an arithmetic number, because the mean of its divisors is an integer number (1983744).

Almost surely, 2^42445940 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 42445940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47609856).

42445940 is an abundant number, since it is smaller than the sum of its proper divisors (52773772).

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

42445940 is a wasteful number, since it uses less digits than its factorization.

42445940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 42445940 is about 6515.0548731381. The cubic root of 42445940 is about 348.8285734841.

It can be divided in two parts, 424 and 45940, that added together give a palindrome (46364).

The spelling of 42445940 in words is "forty-two million, four hundred forty-five thousand, nine hundred forty".