210005540 has 24 divisors (see below), whose sum is σ = 442161720. Its totient is φ = 83783168.

The previous prime is 210005531. The next prime is 210005561. The reversal of 210005540 is 45500012.

It can be written as a sum of positive squares in 4 ways, for example, as 2184484 + 207821056 = 1478^2 + 14416^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5717 + ... + 21276.

It is an arithmetic number, because the mean of its divisors is an integer number (18423405).

Almost surely, 2^210005540 is an apocalyptic number.

210005540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210005540 is an abundant number, since it is smaller than the sum of its proper divisors (232156180).

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

210005540 is a wasteful number, since it uses less digits than its factorization.

210005540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27391 (or 27389 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 210005540 is about 14491.5678930887. The cubic root of 210005540 is about 594.3974221078.

Adding to 210005540 its reverse (45500012), we get a palindrome (255505552).

The spelling of 210005540 in words is "two hundred ten million, five thousand, five hundred forty".