84279861 has 6 divisors (see below), whose sum is σ = 121737590. Its totient is φ = 56186568.

The previous prime is 84279851. The next prime is 84279893. The reversal of 84279861 is 16897248.

It can be written as a sum of positive squares in only one way, i.e., 43639236 + 40640625 = 6606^2 + 6375^2 .

It is not a de Polignac number, because 84279861 - 2¹⁰ = 84278837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84279841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4682206 + ... + 4682223.

Almost surely, 2^84279861 is an apocalyptic number.

It is an amenable number.

84279861 is a deficient number, since it is larger than the sum of its proper divisors (37457729).

84279861 is a wasteful number, since it uses less digits than its factorization.

84279861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9364435 (or 9364432 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 84279861 is about 9180.4063635549. The cubic root of 84279861 is about 438.4377465107.

The spelling of 84279861 in words is "eighty-four million, two hundred seventy-nine thousand, eight hundred sixty-one".