42040188 has 48 divisors (see below), whose sum is σ = 110144160. Its totient is φ = 13865472.

The previous prime is 42040157. The next prime is 42040199. The reversal of 42040188 is 88104024.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 8470 + ... + 12482.

It is an arithmetic number, because the mean of its divisors is an integer number (2294670).

Almost surely, 2^42040188 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 42040188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55072080).

42040188 is an abundant number, since it is smaller than the sum of its proper divisors (68103972).

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

42040188 is a wasteful number, since it uses less digits than its factorization.

42040188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123 (or 4115 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 42040188 is about 6483.8405285756. The cubic root of 42040188 is about 347.7134978431.

The spelling of 42040188 in words is "forty-two million, forty thousand, one hundred eighty-eight".