42747779 has 8 divisors (see below), whose sum is σ = 43130880. Its totient is φ = 42366856.

The previous prime is 42747773. The next prime is 42747797. The reversal of 42747779 is 97774724.

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 a de Polignac number, because none of the positive numbers 2^k-42747779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42747773) 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, 91304 + ... + 91770.

It is an arithmetic number, because the mean of its divisors is an integer number (5391360).

Almost surely, 2^42747779 is an apocalyptic number.

42747779 is a deficient number, since it is larger than the sum of its proper divisors (383101).

42747779 is a wasteful number, since it uses less digits than its factorization.

42747779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089.

The product of its digits is 691488, while the sum is 47.

The square root of 42747779 is about 6538.1785689900. The cubic root of 42747779 is about 349.6534774417.

The spelling of 42747779 in words is "forty-two million, seven hundred forty-seven thousand, seven hundred seventy-nine".