42479779 has 2 divisors, whose sum is σ = 42479780. Its totient is φ = 42479778.

The previous prime is 42479777. The next prime is 42479783. The reversal of 42479779 is 97797424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42479779 - 2¹ = 42479777 is a prime.

Together with 42479777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42479771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21239889 + 21239890.

It is an arithmetic number, because the mean of its divisors is an integer number (21239890).

Almost surely, 2^42479779 is an apocalyptic number.

42479779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42479779 is an equidigital number, since it uses as much as digits as its factorization.

42479779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The square root of 42479779 is about 6517.6513407822. The cubic root of 42479779 is about 348.9212472448.

The spelling of 42479779 in words is "forty-two million, four hundred seventy-nine thousand, seven hundred seventy-nine".