210045440 has 80 divisors (see below), whose sum is σ = 549473760. Its totient is φ = 76369920.

The previous prime is 210045439. The next prime is 210045443. The reversal of 210045440 is 44540012.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (210045443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24431 + ... + 31889.

It is an arithmetic number, because the mean of its divisors is an integer number (6868422).

Almost surely, 2^210045440 is an apocalyptic number.

210045440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210045440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274736880).

210045440 is an abundant number, since it is smaller than the sum of its proper divisors (339428320).

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

210045440 is an equidigital number, since it uses as much as digits as its factorization.

210045440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493 (or 7477 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 210045440 is about 14492.9444903374. The cubic root of 210045440 is about 594.4350639009.

Adding to 210045440 its reverse (44540012), we get a palindrome (254585452).

The spelling of 210045440 in words is "two hundred ten million, forty-five thousand, four hundred forty".