9120805 has 8 divisors (see below), whose sum is σ = 11053944. Its totient is φ = 7224000.

The previous prime is 9120803. The next prime is 9120821. The reversal of 9120805 is 5080219.

It can be written as a sum of positive squares in 4 ways, for example, as 4532641 + 4588164 = 2129^2 + 2142^2 .

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

It is not a de Polignac number, because 9120805 - 2¹ = 9120803 is a prime.

It is a Duffinian number.

9120805 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9120805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9120803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8526 + ... + 9535.

It is an arithmetic number, because the mean of its divisors is an integer number (1381743).

Almost surely, 2^9120805 is an apocalyptic number.

It is an amenable number.

9120805 is a deficient number, since it is larger than the sum of its proper divisors (1933139).

9120805 is a wasteful number, since it uses less digits than its factorization.

9120805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18167.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 9120805 is about 3020.0670522358. The cubic root of 9120805 is about 208.9349323938.

The spelling of 9120805 in words is "nine million, one hundred twenty thousand, eight hundred five".