42042779 has 8 divisors (see below), whose sum is σ = 43785120. Its totient is φ = 40320000.

The previous prime is 42042743. The next prime is 42042809. The reversal of 42042779 is 97724024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42042779 - 2⁸ = 42042523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42042719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422 + ... + 9179.

It is an arithmetic number, because the mean of its divisors is an integer number (5473140).

Almost surely, 2^42042779 is an apocalyptic number.

42042779 is a deficient number, since it is larger than the sum of its proper divisors (1742341).

42042779 is a wasteful number, since it uses less digits than its factorization.

42042779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9781.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 42042779 is about 6484.0403299178. The cubic root of 42042779 is about 347.7206410649.

The spelling of 42042779 in words is "forty-two million, forty-two thousand, seven hundred seventy-nine".