900404009 has 4 divisors (see below), whose sum is σ = 900464580. Its totient is φ = 900343440.

The previous prime is 900403979. The next prime is 900404027.

900404009 is nontrivially palindromic in base 10.

900404009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 395413225 + 504990784 = 19885^2 + 22472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-900404009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900404809) 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, 8999 + ... + 43379.

It is an arithmetic number, because the mean of its divisors is an integer number (225116145).

Almost surely, 2^900404009 is an apocalyptic number.

It is an amenable number.

900404009 is a deficient number, since it is larger than the sum of its proper divisors (60571).

900404009 is a wasteful number, since it uses less digits than its factorization.

900404009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60570.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 900404009 is about 30006.7327278396. The cubic root of 900404009 is about 965.6338320310.

It can be divided in two parts, 90040 and 4009, that added together give a palindrome (94049).

The spelling of 900404009 in words is "nine hundred million, four hundred four thousand, nine".