42779941 has 2 divisors, whose sum is σ = 42779942. Its totient is φ = 42779940.

The previous prime is 42779921. The next prime is 42780013. The reversal of 42779941 is 14997724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42627841 + 152100 = 6529^2 + 390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42779941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42779911) 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 as a sum of consecutive naturals, namely, 21389970 + 21389971.

It is an arithmetic number, because the mean of its divisors is an integer number (21389971).

Almost surely, 2^42779941 is an apocalyptic number.

It is an amenable number.

42779941 is a deficient number, since it is larger than the sum of its proper divisors (1).

42779941 is an equidigital number, since it uses as much as digits as its factorization.

42779941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 42779941 is about 6540.6376600451. The cubic root of 42779941 is about 349.7411446556.

The spelling of 42779941 in words is "forty-two million, seven hundred seventy-nine thousand, nine hundred forty-one".