900406909 has 4 divisors (see below), whose sum is σ = 915167740. Its totient is φ = 885646080.

The previous prime is 900406907. The next prime is 900406919. The reversal of 900406909 is 909604009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909604009 = 113 ⋅8049593.

It can be written as a sum of positive squares in 2 ways, for example, as 233631225 + 666775684 = 15285^2 + 25822^2 .

It is a cyclic number.

It is not a de Polignac number, because 900406909 - 2¹ = 900406907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900406907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7380324 + ... + 7380445.

It is an arithmetic number, because the mean of its divisors is an integer number (228791935).

Almost surely, 2^900406909 is an apocalyptic number.

It is an amenable number.

900406909 is a deficient number, since it is larger than the sum of its proper divisors (14760831).

900406909 is a wasteful number, since it uses less digits than its factorization.

900406909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14760830.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 900406909 is about 30006.7810502893. The cubic root of 900406909 is about 965.6348687268.

The spelling of 900406909 in words is "nine hundred million, four hundred six thousand, nine hundred nine".