210345140 has 12 divisors (see below), whose sum is σ = 441724836. Its totient is φ = 84138048.

The previous prime is 210345133. The next prime is 210345151. The reversal of 210345140 is 41543012.

It can be written as a sum of positive squares in 2 ways, for example, as 26091664 + 184253476 = 5108^2 + 13574^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10517257 = 210345140 / (2 + 1 + 0 + 3 + 4 + 5 + 1 + 4 + 0).

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 3 ways as a sum of consecutive naturals, for example, 5258609 + ... + 5258648.

It is an arithmetic number, because the mean of its divisors is an integer number (36810403).

Almost surely, 2^210345140 is an apocalyptic number.

210345140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210345140 is an abundant number, since it is smaller than the sum of its proper divisors (231379696).

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

210345140 is a wasteful number, since it uses less digits than its factorization.

210345140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10517266 (or 10517264 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 210345140 is about 14503.2803186038. The cubic root of 210345140 is about 594.7176496191.

Adding to 210345140 its reverse (41543012), we get a palindrome (251888152).

The spelling of 210345140 in words is "two hundred ten million, three hundred forty-five thousand, one hundred forty".