42065940 has 96 divisors (see below), whose sum is σ = 137539584. Its totient is φ = 9406080.

The previous prime is 42065927. The next prime is 42065963. The reversal of 42065940 is 4956024.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 42065898 and 42065907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18675 + ... + 20805.

It is an arithmetic number, because the mean of its divisors is an integer number (1432704).

Almost surely, 2^42065940 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 42065940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68769792).

42065940 is an abundant number, since it is smaller than the sum of its proper divisors (95473644).

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

42065940 is a wasteful number, since it uses less digits than its factorization.

42065940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2195 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 42065940 is about 6485.8260846248. The cubic root of 42065940 is about 347.7844814320.

The spelling of 42065940 in words is "forty-two million, sixty-five thousand, nine hundred forty".