86190821 has 8 divisors (see below), whose sum is σ = 94672320. Its totient is φ = 78103872.

The previous prime is 86190803. The next prime is 86190829. The reversal of 86190821 is 12809168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86190821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86190829) 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 7 ways as a sum of consecutive naturals, for example, 98180 + ... + 99053.

It is an arithmetic number, because the mean of its divisors is an integer number (11834040).

Almost surely, 2^86190821 is an apocalyptic number.

It is an amenable number.

86190821 is a deficient number, since it is larger than the sum of its proper divisors (8481499).

86190821 is a wasteful number, since it uses less digits than its factorization.

86190821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197275.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 86190821 is about 9283.9011735369. The cubic root of 86190821 is about 441.7267220737.

Adding to 86190821 its reverse (12809168), we get a palindrome (98999989).

The spelling of 86190821 in words is "eighty-six million, one hundred ninety thousand, eight hundred twenty-one".