42778174 has 4 divisors (see below), whose sum is σ = 64167264. Its totient is φ = 21389086.

The previous prime is 42778159. The next prime is 42778187. The reversal of 42778174 is 47187724.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694542 + ... + 10694545.

It is an arithmetic number, because the mean of its divisors is an integer number (16041816).

Almost surely, 2^42778174 is an apocalyptic number.

42778174 is a deficient number, since it is larger than the sum of its proper divisors (21389090).

42778174 is a wasteful number, since it uses less digits than its factorization.

42778174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21389089.

The product of its digits is 87808, while the sum is 40.

The square root of 42778174 is about 6540.5025800775. The cubic root of 42778174 is about 349.7363293061.

The spelling of 42778174 in words is "forty-two million, seven hundred seventy-eight thousand, one hundred seventy-four".