210340340 has 72 divisors (see below), whose sum is σ = 521240832. Its totient is φ = 71077440.

The previous prime is 210340327. The next prime is 210340357. The reversal of 210340340 is 43043012.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 68069 + ... + 71091.

It is an arithmetic number, because the mean of its divisors is an integer number (7239456).

Almost surely, 2^210340340 is an apocalyptic number.

210340340 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 210340340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260620416).

210340340 is an abundant number, since it is smaller than the sum of its proper divisors (310900492).

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

210340340 is a wasteful number, since it uses less digits than its factorization.

210340340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117 (or 3108 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 210340340 is about 14503.1148378547. The cubic root of 210340340 is about 594.7131258375.

Adding to 210340340 its reverse (43043012), we get a palindrome (253383352).

The spelling of 210340340 in words is "two hundred ten million, three hundred forty thousand, three hundred forty".