84278869 has 2 divisors, whose sum is σ = 84278870. Its totient is φ = 84278868.

The previous prime is 84278861. The next prime is 84278879. The reversal of 84278869 is 96887248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83046769 + 1232100 = 9113^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 84278869 - 2³ = 84278861 is a prime.

It is a super-2 number, since 2×84278869² = 14205855519838322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84278861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42139434 + 42139435.

It is an arithmetic number, because the mean of its divisors is an integer number (42139435).

Almost surely, 2^84278869 is an apocalyptic number.

It is an amenable number.

84278869 is a deficient number, since it is larger than the sum of its proper divisors (1).

84278869 is an equidigital number, since it uses as much as digits as its factorization.

84278869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 52.

The square root of 84278869 is about 9180.3523352865. The cubic root of 84278869 is about 438.4360263214.

The spelling of 84278869 in words is "eighty-four million, two hundred seventy-eight thousand, eight hundred sixty-nine".