210240140 has 96 divisors (see below), whose sum is σ = 514805760. Its totient is φ = 71366400.

The previous prime is 210240137. The next prime is 210240157. The reversal of 210240140 is 41042012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197249 + ... + 198311.

It is an arithmetic number, because the mean of its divisors is an integer number (5362560).

Almost surely, 2^210240140 is an apocalyptic number.

210240140 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 210240140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257402880).

210240140 is an abundant number, since it is smaller than the sum of its proper divisors (304565620).

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

210240140 is a wasteful number, since it uses less digits than its factorization.

210240140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 210240140 is about 14499.6599960137. The cubic root of 210240140 is about 594.6186761786.

Adding to 210240140 its reverse (41042012), we get a palindrome (251282152).

The spelling of 210240140 in words is "two hundred ten million, two hundred forty thousand, one hundred forty".