42138194 has 16 divisors (see below), whose sum is σ = 73917888. Its totient is φ = 17638992.

The previous prime is 42138191. The next prime is 42138199. The reversal of 42138194 is 49183124.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42138194.

It is not an unprimeable number, because it can be changed into a prime (42138191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34397 + ... + 35600.

It is an arithmetic number, because the mean of its divisors is an integer number (4619868).

Almost surely, 2^42138194 is an apocalyptic number.

42138194 is a deficient number, since it is larger than the sum of its proper divisors (31779694).

42138194 is a wasteful number, since it uses less digits than its factorization.

42138194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70049.

The product of its digits is 6912, while the sum is 32.

The square root of 42138194 is about 6491.3938410791. The cubic root of 42138194 is about 347.9834899905.

The spelling of 42138194 in words is "forty-two million, one hundred thirty-eight thousand, one hundred ninety-four".