42129877 has 2 divisors, whose sum is σ = 42129878. Its totient is φ = 42129876.

The previous prime is 42129869. The next prime is 42129911. The reversal of 42129877 is 77892124.

42129877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41873841 + 256036 = 6471^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 42129877 - 2³ = 42129869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42129847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21064938 + 21064939.

It is an arithmetic number, because the mean of its divisors is an integer number (21064939).

Almost surely, 2^42129877 is an apocalyptic number.

It is an amenable number.

42129877 is a deficient number, since it is larger than the sum of its proper divisors (1).

42129877 is an equidigital number, since it uses as much as digits as its factorization.

42129877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 42129877 is about 6490.7531920417. The cubic root of 42129877 is about 347.9605941420.

The spelling of 42129877 in words is "forty-two million, one hundred twenty-nine thousand, eight hundred seventy-seven".