42000056 has 48 divisors (see below), whose sum is σ = 92169000. Its totient is φ = 17889984.

The previous prime is 42000037. The next prime is 42000059. The reversal of 42000056 is 65000024.

It is a junction number, because it is equal to n+sod(n) for n = 41999998 and 42000043.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42000059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120170 + ... + 120518.

Almost surely, 2^42000056 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 42000056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46084500).

42000056 is an abundant number, since it is smaller than the sum of its proper divisors (50168944).

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

42000056 is a wasteful number, since it uses less digits than its factorization.

42000056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42000056 is about 6480.7450189002. The cubic root of 42000056 is about 347.6028189786.

The spelling of 42000056 in words is "forty-two million, fifty-six", and thus it is an aban number, an eban number, and an uban number.