8120929 has 4 divisors (see below), whose sum is σ = 8126740. Its totient is φ = 8115120.

The previous prime is 8120921. The next prime is 8120933. The reversal of 8120929 is 9290218.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2250000 + 5870929 = 1500^2 + 2423^2 .

It is a cyclic number.

It is not a de Polignac number, because 8120929 - 2³ = 8120921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8120929.

It is not an unprimeable number, because it can be changed into a prime (8120921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607 + ... + 4075.

It is an arithmetic number, because the mean of its divisors is an integer number (2031685).

Almost surely, 2^8120929 is an apocalyptic number.

It is an amenable number.

8120929 is a deficient number, since it is larger than the sum of its proper divisors (5811).

8120929 is a wasteful number, since it uses less digits than its factorization.

8120929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 8120929 is about 2849.7243726368. The cubic root of 8120929 is about 201.0027061672.

The spelling of 8120929 in words is "eight million, one hundred twenty thousand, nine hundred twenty-nine".