8120945 has 16 divisors (see below), whose sum is σ = 11440128. Its totient is φ = 5417280.

The previous prime is 8120941. The next prime is 8120953. The reversal of 8120945 is 5490218.

It is not a de Polignac number, because 8120945 - 2² = 8120941 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8120941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1841 + ... + 4430.

It is an arithmetic number, because the mean of its divisors is an integer number (715008).

Almost surely, 2^8120945 is an apocalyptic number.

It is an amenable number.

8120945 is a deficient number, since it is larger than the sum of its proper divisors (3319183).

8120945 is a wasteful number, since it uses less digits than its factorization.

8120945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 8120945 is about 2849.7271799244. The cubic root of 8120945 is about 201.0028381735.

The spelling of 8120945 in words is "eight million, one hundred twenty thousand, nine hundred forty-five".