84438181 has 8 divisors (see below), whose sum is σ = 86835320. Its totient is φ = 82047168.

The previous prime is 84438173. The next prime is 84438199. The reversal of 84438181 is 18183448.

It can be written as a sum of positive squares in 4 ways, for example, as 3276100 + 81162081 = 1810^2 + 9009^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 84438181 - 2³ = 84438173 is a prime.

It is a super-2 number, since 2×84438181² = 14259612821177522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84438181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84438131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52075 + ... + 53671.

It is an arithmetic number, because the mean of its divisors is an integer number (10854415).

Almost surely, 2^84438181 is an apocalyptic number.

It is an amenable number.

84438181 is a deficient number, since it is larger than the sum of its proper divisors (2397139).

84438181 is a wasteful number, since it uses less digits than its factorization.

84438181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063.

The product of its digits is 24576, while the sum is 37.

The square root of 84438181 is about 9189.0250298930. The cubic root of 84438181 is about 438.7121103743.

The spelling of 84438181 in words is "eighty-four million, four hundred thirty-eight thousand, one hundred eighty-one".