42915779 has 2 divisors, whose sum is σ = 42915780. Its totient is φ = 42915778.

The previous prime is 42915773. The next prime is 42915791. The reversal of 42915779 is 97751924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42915779 - 2¹² = 42911683 is a prime.

It is a Chen prime.

It is equal to p_2599757 and since 42915779 and 2599757 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42915773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21457889 + 21457890.

It is an arithmetic number, because the mean of its divisors is an integer number (21457890).

Almost surely, 2^42915779 is an apocalyptic number.

42915779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42915779 is an equidigital number, since it uses as much as digits as its factorization.

42915779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 42915779 is about 6551.0135856980. The cubic root of 42915779 is about 350.1109281043.

The spelling of 42915779 in words is "forty-two million, nine hundred fifteen thousand, seven hundred seventy-nine".