42784039 has 2 divisors, whose sum is σ = 42784040. Its totient is φ = 42784038.

The previous prime is 42784031. The next prime is 42784069. The reversal of 42784039 is 93048724.

It is a happy number.

42784039 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 is a cyclic number.

It is not a de Polignac number, because 42784039 - 2³ = 42784031 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42783989 and 42784007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42784031) 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, 21392019 + 21392020.

It is an arithmetic number, because the mean of its divisors is an integer number (21392020).

Almost surely, 2^42784039 is an apocalyptic number.

42784039 is a deficient number, since it is larger than the sum of its proper divisors (1).

42784039 is an equidigital number, since it uses as much as digits as its factorization.

42784039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 42784039 is about 6540.9509247509. The cubic root of 42784039 is about 349.7523118321.

The spelling of 42784039 in words is "forty-two million, seven hundred eighty-four thousand, thirty-nine".