42784069 has 2 divisors, whose sum is σ = 42784070. Its totient is φ = 42784068.

The previous prime is 42784039. The next prime is 42784127. The reversal of 42784069 is 96048724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 1181569 = 6450^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 42784069 - 2⁹ = 42783557 is a prime.

It is a super-2 number, since 2×42784069² = 3660953120393522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42784039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21392034 + 21392035.

It is an arithmetic number, because the mean of its divisors is an integer number (21392035).

Almost surely, 2^42784069 is an apocalyptic number.

It is an amenable number.

42784069 is a deficient number, since it is larger than the sum of its proper divisors (1).

42784069 is an equidigital number, since it uses as much as digits as its factorization.

42784069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 42784069 is about 6540.9532179951. The cubic root of 42784069 is about 349.7523935804.

The spelling of 42784069 in words is "forty-two million, seven hundred eighty-four thousand, sixty-nine".