82186789 has 8 divisors (see below), whose sum is σ = 87399000. Its totient is φ = 77016576.

The previous prime is 82186787. The next prime is 82186829. The reversal of 82186789 is 98768128.

It can be written as a sum of positive squares in 4 ways, for example, as 429025 + 81757764 = 655^2 + 9042^2 .

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 82186789 - 2¹ = 82186787 is a prime.

It is a super-2 number, since 2×82186789² = 13509336572261042, 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 (82186787) 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, 6414 + ... + 14335.

It is an arithmetic number, because the mean of its divisors is an integer number (10924875).

Almost surely, 2^82186789 is an apocalyptic number.

It is an amenable number.

82186789 is a deficient number, since it is larger than the sum of its proper divisors (5212211).

82186789 is a wasteful number, since it uses less digits than its factorization.

82186789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20999.

The product of its digits is 387072, while the sum is 49.

The square root of 82186789 is about 9065.6929685491. The cubic root of 82186789 is about 434.7777770134. Note that the first 6 decimals are identical.

The spelling of 82186789 in words is "eighty-two million, one hundred eighty-six thousand, seven hundred eighty-nine".