42878911 has 2 divisors, whose sum is σ = 42878912. Its totient is φ = 42878910.

The previous prime is 42878903. The next prime is 42878929. The reversal of 42878911 is 11987824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42878911 - 2³ = 42878903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42878971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439455 + 21439456.

It is an arithmetic number, because the mean of its divisors is an integer number (21439456).

Almost surely, 2^42878911 is an apocalyptic number.

42878911 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878911 is an equidigital number, since it uses as much as digits as its factorization.

42878911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 42878911 is about 6548.1990653919. The cubic root of 42878911 is about 350.0106418533.

The spelling of 42878911 in words is "forty-two million, eight hundred seventy-eight thousand, nine hundred eleven".