909905980 has 24 divisors (see below), whose sum is σ = 1911884688. Its totient is φ = 363756288.

The previous prime is 909905959. The next prime is 909905987. The reversal of 909905980 is 89509909.

It is a super-3 number, since 3×909905980³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909905987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26212 + ... + 50068.

It is an arithmetic number, because the mean of its divisors is an integer number (79661862).

Almost surely, 2^909905980 is an apocalyptic number.

It is an amenable number.

909905980 is an abundant number, since it is smaller than the sum of its proper divisors (1001978708).

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

909905980 is a wasteful number, since it uses less digits than its factorization.

909905980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25773 (or 25771 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 909905980 is about 30164.6478514171. The cubic root of 909905980 is about 969.0187334653.

The spelling of 909905980 in words is "nine hundred nine million, nine hundred five thousand, nine hundred eighty".