42040656 has 120 divisors (see below), whose sum is σ = 135794880. Its totient is φ = 11893248.

The previous prime is 42040637. The next prime is 42040667. The reversal of 42040656 is 65604024.

It is a happy number.

42040656 is a `hidden beast` number, since 4 + 2 + 0 + 4 + 0 + 656 = 666.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180316 + ... + 180548.

It is an arithmetic number, because the mean of its divisors is an integer number (1131624).

Almost surely, 2^42040656 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 42040656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67897440).

42040656 is an abundant number, since it is smaller than the sum of its proper divisors (93754224).

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

42040656 is a wasteful number, since it uses less digits than its factorization.

42040656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 42040656 is about 6483.8766181969. The cubic root of 42040656 is about 347.7147881109.

The spelling of 42040656 in words is "forty-two million, forty thousand, six hundred fifty-six".