86199921 has 6 divisors (see below), whose sum is σ = 124511010. Its totient is φ = 57466608.

The previous prime is 86199913. The next prime is 86199931. The reversal of 86199921 is 12999168.

86199921 is a `hidden beast` number, since 8 + 619 + 9 + 9 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 85821696 + 378225 = 9264^2 + 615^2 .

It is not a de Polignac number, because 86199921 - 2³ = 86199913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86199901) 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 5 ways as a sum of consecutive naturals, for example, 4788876 + ... + 4788893.

It is an arithmetic number, because the mean of its divisors is an integer number (20751835).

Almost surely, 2^86199921 is an apocalyptic number.

It is an amenable number.

86199921 is a deficient number, since it is larger than the sum of its proper divisors (38311089).

86199921 is a wasteful number, since it uses less digits than its factorization.

86199921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9577775 (or 9577772 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 86199921 is about 9284.3912562968. The cubic root of 86199921 is about 441.7422673165.

The spelling of 86199921 in words is "eighty-six million, one hundred ninety-nine thousand, nine hundred twenty-one".