920009 has 4 divisors (see below), whose sum is σ = 929220. Its totient is φ = 910800.

The previous prime is 919979. The next prime is 920011. The reversal of 920009 is 900029.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900029 = 13 ⋅69233.

It can be written as a sum of positive squares in 2 ways, for example, as 525625 + 394384 = 725^2 + 628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (920039) 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, 4454 + ... + 4655.

It is an arithmetic number, because the mean of its divisors is an integer number (232305).

2⁹²⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

920009 is a deficient number, since it is larger than the sum of its proper divisors (9211).

920009 is a wasteful number, since it uses less digits than its factorization.

920009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9210.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 920009 is about 959.1709962254. The cubic root of 920009 is about 97.2591997694.

Adding to 920009 its sum of digits (20), we get a palindrome (920029).

It can be divided in two parts, 9 and 20009, that multiplied together give a palindrome (180081).

The spelling of 920009 in words is "nine hundred twenty thousand, nine".