42078194 has 4 divisors (see below), whose sum is σ = 63117294. Its totient is φ = 21039096.

The previous prime is 42078187. The next prime is 42078233. The reversal of 42078194 is 49187024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25877569 + 16200625 = 5087^2 + 4025^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519547 + ... + 10519550.

Almost surely, 2^42078194 is an apocalyptic number.

42078194 is a deficient number, since it is larger than the sum of its proper divisors (21039100).

42078194 is a wasteful number, since it uses less digits than its factorization.

42078194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21039099.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 42078194 is about 6486.7706911837. The cubic root of 42078194 is about 347.8182485548.

The spelling of 42078194 in words is "forty-two million, seventy-eight thousand, one hundred ninety-four".