42799779 has 32 divisors (see below), whose sum is σ = 70502400. Its totient is φ = 25440480.

The previous prime is 42799769. The next prime is 42799781. The reversal of 42799779 is 97799724.

It is not a de Polignac number, because 42799779 - 2⁴ = 42799763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42799739) 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 31 ways as a sum of consecutive naturals, for example, 14382 + ... + 17100.

It is an arithmetic number, because the mean of its divisors is an integer number (2203200).

Almost surely, 2^42799779 is an apocalyptic number.

42799779 is a deficient number, since it is larger than the sum of its proper divisors (27702621).

42799779 is a wasteful number, since it uses less digits than its factorization.

42799779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792 (or 2786 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 42799779 is about 6542.1540030788. The cubic root of 42799779 is about 349.7951971896.

Subtracting 42799779 from its reverse (97799724), we obtain a palindrome (54999945).

The spelling of 42799779 in words is "forty-two million, seven hundred ninety-nine thousand, seven hundred seventy-nine".