84347861 has 4 divisors (see below), whose sum is σ = 90836172. Its totient is φ = 77859552.

The previous prime is 84347839. The next prime is 84347891. The reversal of 84347861 is 16874348.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25150225 + 59197636 = 5015^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 84347861 - 2¹⁴ = 84331477 is a prime.

It is a super-2 number, since 2×84347861² = 14229123310550642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84347891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3244136 + ... + 3244161.

It is an arithmetic number, because the mean of its divisors is an integer number (22709043).

Almost surely, 2^84347861 is an apocalyptic number.

It is an amenable number.

84347861 is a deficient number, since it is larger than the sum of its proper divisors (6488311).

84347861 is a wasteful number, since it uses less digits than its factorization.

84347861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488310.

The product of its digits is 129024, while the sum is 41.

The square root of 84347861 is about 9184.1091565813. The cubic root of 84347861 is about 438.5556305530. Note that the first 3 decimals are identical.

The spelling of 84347861 in words is "eighty-four million, three hundred forty-seven thousand, eight hundred sixty-one".