212432340 has 72 divisors (see below), whose sum is σ = 631909152. Its totient is φ = 53312000.

The previous prime is 212432333. The next prime is 212432377. The reversal of 212432340 is 43234212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11215 + ... + 23465.

It is an arithmetic number, because the mean of its divisors is an integer number (8776516).

Almost surely, 2^212432340 is an apocalyptic number.

212432340 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 212432340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315954576).

212432340 is an abundant number, since it is smaller than the sum of its proper divisors (419476812).

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

212432340 is a wasteful number, since it uses less digits than its factorization.

212432340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12297 (or 12278 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 212432340 is about 14575.0588335005. The cubic root of 212432340 is about 596.6782550659.

Adding to 212432340 its reverse (43234212), we get a palindrome (255666552).

The spelling of 212432340 in words is "two hundred twelve million, four hundred thirty-two thousand, three hundred forty".