909099920 has 20 divisors (see below), whose sum is σ = 2113657500. Its totient is φ = 363639936.

The previous prime is 909099901. The next prime is 909099967. The reversal of 909099920 is 29990909.

It is a happy number.

909099920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 629407744 + 279692176 = 25088^2 + 16724^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5681795 + ... + 5681954.

It is an arithmetic number, because the mean of its divisors is an integer number (105682875).

Almost surely, 2^909099920 is an apocalyptic number.

It is an amenable number.

909099920 is an abundant number, since it is smaller than the sum of its proper divisors (1204557580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

909099920 is a wasteful number, since it uses less digits than its factorization.

909099920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11363762 (or 11363756 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 909099920 is about 30151.2838864285. The cubic root of 909099920 is about 968.7325068225.

It can be divided in two parts, 909099 and 920, that added together give a palindrome (910019).

The spelling of 909099920 in words is "nine hundred nine million, ninety-nine thousand, nine hundred twenty".