212340240 has 120 divisors (see below), whose sum is σ = 815001408. Its totient is φ = 48533760.

The previous prime is 212340187. The next prime is 212340241. The reversal of 212340240 is 42043212.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (212340241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16026 + ... + 26105.

Almost surely, 2^212340240 is an apocalyptic number.

212340240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212340240 is an abundant number, since it is smaller than the sum of its proper divisors (602661168).

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

212340240 is a wasteful number, since it uses less digits than its factorization.

212340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42157 (or 42148 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 212340240 is about 14571.8989840034. The cubic root of 212340240 is about 596.5920126871.

Adding to 212340240 its reverse (42043212), we get a palindrome (254383452).

The spelling of 212340240 in words is "two hundred twelve million, three hundred forty thousand, two hundred forty".