8121028399 has 8 divisors (see below), whose sum is σ = 8886072960. Its totient is φ = 7360445400.

The previous prime is 8121028397. The next prime is 8121028423. The reversal of 8121028399 is 9938201218.

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

It is not a de Polignac number, because 8121028399 - 2¹ = 8121028397 is a prime.

It is a super-2 number, since 2×8121028399² (a number of 21 digits) 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 (8121028397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111579 + ... + 1118860.

It is an arithmetic number, because the mean of its divisors is an integer number (1110759120).

Almost surely, 2^8121028399 is an apocalyptic number.

8121028399 is a deficient number, since it is larger than the sum of its proper divisors (765044561).

8121028399 is a wasteful number, since it uses less digits than its factorization.

8121028399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230781.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 8121028399 is about 90116.7487152083. The cubic root of 8121028399 is about 2010.0352624524.

The spelling of 8121028399 in words is "eight billion, one hundred twenty-one million, twenty-eight thousand, three hundred ninety-nine".