212340440 has 32 divisors (see below), whose sum is σ = 514518480. Its totient is φ = 78402432.

The previous prime is 212340437. The next prime is 212340449. The reversal of 212340440 is 44043212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212340449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203654 + ... + 204693.

Almost surely, 2^212340440 is an apocalyptic number.

212340440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212340440 is an abundant number, since it is smaller than the sum of its proper divisors (302178040).

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

212340440 is a wasteful number, since it uses less digits than its factorization.

212340440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408371 (or 408367 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 212340440 is about 14571.9058465254. The cubic root of 212340440 is about 596.5921999940.

Adding to 212340440 its reverse (44043212), we get a palindrome (256383652).

The spelling of 212340440 in words is "two hundred twelve million, three hundred forty thousand, four hundred forty".