84085861 has 4 divisors (see below), whose sum is σ = 87741792. Its totient is φ = 80429932.

The previous prime is 84085831. The next prime is 84085873. The reversal of 84085861 is 16858048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84085861 - 2⁵ = 84085829 is a prime.

It is a super-2 number, since 2×84085861² = 14140864040222642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84085831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1827931 + ... + 1827976.

It is an arithmetic number, because the mean of its divisors is an integer number (21935448).

Almost surely, 2^84085861 is an apocalyptic number.

It is an amenable number.

84085861 is a deficient number, since it is larger than the sum of its proper divisors (3655931).

84085861 is a wasteful number, since it uses less digits than its factorization.

84085861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655930.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 84085861 is about 9169.8342951222. The cubic root of 84085861 is about 438.1010813877.

The spelling of 84085861 in words is "eighty-four million, eighty-five thousand, eight hundred sixty-one".