42140779 has 2 divisors, whose sum is σ = 42140780. Its totient is φ = 42140778.

The previous prime is 42140767. The next prime is 42140821. The reversal of 42140779 is 97704124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42140779 - 2²³ = 33752171 is a prime.

It is not a weakly prime, because it can be changed into another prime (42140729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21070389 + 21070390.

It is an arithmetic number, because the mean of its divisors is an integer number (21070390).

Almost surely, 2^42140779 is an apocalyptic number.

42140779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42140779 is an equidigital number, since it uses as much as digits as its factorization.

42140779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 42140779 is about 6491.5929478056. The cubic root of 42140779 is about 347.9906056168.

The spelling of 42140779 in words is "forty-two million, one hundred forty thousand, seven hundred seventy-nine".