42778179 has 16 divisors (see below), whose sum is σ = 65089440. Its totient is φ = 27747360.

The previous prime is 42778159. The next prime is 42778187. The reversal of 42778179 is 97187724.

It is a happy number.

42778179 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42778179 - 2⁷ = 42778051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42778159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20412 + ... + 22409.

It is an arithmetic number, because the mean of its divisors is an integer number (4068090).

Almost surely, 2^42778179 is an apocalyptic number.

42778179 is a deficient number, since it is larger than the sum of its proper divisors (22311261).

42778179 is a wasteful number, since it uses less digits than its factorization.

42778179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42867 (or 42861 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 42778179 is about 6540.5029623111. The cubic root of 42778179 is about 349.7363429320.

It can be divided in two parts, 427 and 78179, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 42778179 in words is "forty-two million, seven hundred seventy-eight thousand, one hundred seventy-nine".