210940 has 24 divisors (see below), whose sum is σ = 453600. Its totient is φ = 82368.

The previous prime is 210929. The next prime is 210943. The reversal of 210940 is 49012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210943) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 961 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (18900).

2²¹⁰⁹⁴⁰ is an apocalyptic number.

210940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210940 is an abundant number, since it is smaller than the sum of its proper divisors (242660).

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

210940 is a wasteful number, since it uses less digits than its factorization.

210940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 210940 is about 459.2820484191. The cubic root of 210940 is about 59.5277746184.

Adding to 210940 its reverse (49012), we get a palindrome (259952).

The spelling of 210940 in words is "two hundred ten thousand, nine hundred forty".