210540340 has 12 divisors (see below), whose sum is σ = 442134756. Its totient is φ = 84216128.

The previous prime is 210540283. The next prime is 210540353. The reversal of 210540340 is 43045012.

It can be written as a sum of positive squares in 2 ways, for example, as 165328164 + 45212176 = 12858^2 + 6724^2 .

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, 5263489 + ... + 5263528.

It is an arithmetic number, because the mean of its divisors is an integer number (36844563).

Almost surely, 2^210540340 is an apocalyptic number.

210540340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210540340 is an abundant number, since it is smaller than the sum of its proper divisors (231594416).

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

210540340 is a wasteful number, since it uses less digits than its factorization.

210540340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10527026 (or 10527024 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 210540340 is about 14510.0082701562. The cubic root of 210540340 is about 594.9015584615.

Adding to 210540340 its reverse (43045012), we get a palindrome (253585352).

The spelling of 210540340 in words is "two hundred ten million, five hundred forty thousand, three hundred forty".