84181209 has 8 divisors (see below), whose sum is σ = 128276160. Its totient is φ = 48103536.

The previous prime is 84181199. The next prime is 84181217. The reversal of 84181209 is 90218148.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84181209 - 2¹² = 84177113 is a prime.

It is a super-3 number, since 3×84181209³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84181209.

It is not an unprimeable number, because it can be changed into a prime (84181249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2004294 + ... + 2004335.

It is an arithmetic number, because the mean of its divisors is an integer number (16034520).

Almost surely, 2^84181209 is an apocalyptic number.

It is an amenable number.

84181209 is a deficient number, since it is larger than the sum of its proper divisors (44094951).

84181209 is a wasteful number, since it uses less digits than its factorization.

84181209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008639.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 84181209 is about 9175.0318255579. The cubic root of 84181209 is about 438.2666117254.

The spelling of 84181209 in words is "eighty-four million, one hundred eighty-one thousand, two hundred nine".