84042869 has 2 divisors, whose sum is σ = 84042870. Its totient is φ = 84042868.

The previous prime is 84042823. The next prime is 84042877. The reversal of 84042869 is 96824048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81902500 + 2140369 = 9050^2 + 1463^2 .

It is a cyclic number.

It is not a de Polignac number, because 84042869 - 2⁸ = 84042613 is a prime.

It is a super-2 number, since 2×84042869² = 14126407659502322, which contains 22 as substring.

It is equal to p_4891469 and since 84042869 and 4891469 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84045869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42021434 + 42021435.

It is an arithmetic number, because the mean of its divisors is an integer number (42021435).

Almost surely, 2^84042869 is an apocalyptic number.

It is an amenable number.

84042869 is a deficient number, since it is larger than the sum of its proper divisors (1).

84042869 is an equidigital number, since it uses as much as digits as its factorization.

84042869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 84042869 is about 9167.4897872864. The cubic root of 84042869 is about 438.0264035430.

The spelling of 84042869 in words is "eighty-four million, forty-two thousand, eight hundred sixty-nine".