864808421 has 8 divisors (see below), whose sum is σ = 873151488. Its totient is φ = 856492000.

The previous prime is 864808397. The next prime is 864808423. The reversal of 864808421 is 124808468.

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-864808421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864808423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61916 + ... + 74586.

It is an arithmetic number, because the mean of its divisors is an integer number (109143936).

Almost surely, 2^864808421 is an apocalyptic number.

It is an amenable number.

864808421 is a deficient number, since it is larger than the sum of its proper divisors (8343067).

864808421 is a wasteful number, since it uses less digits than its factorization.

864808421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323.

The product of its (nonzero) digits is 98304, while the sum is 41.

The square root of 864808421 is about 29407.6252186401. The cubic root of 864808421 is about 952.7375960670.

The spelling of 864808421 in words is "eight hundred sixty-four million, eight hundred eight thousand, four hundred twenty-one".