213240340 has 24 divisors (see below), whose sum is σ = 448100352. Its totient is φ = 85239840.

The previous prime is 213240331. The next prime is 213240347. The reversal of 213240340 is 43042312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213240347) 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, 41725 + ... + 46555.

It is an arithmetic number, because the mean of its divisors is an integer number (18670848).

Almost surely, 2^213240340 is an apocalyptic number.

213240340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213240340 is an abundant number, since it is smaller than the sum of its proper divisors (234860012).

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

213240340 is a wasteful number, since it uses less digits than its factorization.

213240340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047 (or 7045 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 213240340 is about 14602.7511106640. The cubic root of 213240340 is about 597.4337992632.

Adding to 213240340 its reverse (43042312), we get a palindrome (256282652).

The spelling of 213240340 in words is "two hundred thirteen million, two hundred forty thousand, three hundred forty".