212400340 has 24 divisors (see below), whose sum is σ = 449255520. Its totient is φ = 84347808.

The previous prime is 212400323. The next prime is 212400361. The reversal of 212400340 is 43004212.

212400340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212400340² = 90227808864231200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35422 + ... + 40981.

It is an arithmetic number, because the mean of its divisors is an integer number (18718980).

Almost surely, 2^212400340 is an apocalyptic number.

212400340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212400340 is an abundant number, since it is smaller than the sum of its proper divisors (236855180).

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

212400340 is a wasteful number, since it uses less digits than its factorization.

212400340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76551 (or 76549 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 212400340 is about 14573.9610264334. The cubic root of 212400340 is about 596.6482931135.

Adding to 212400340 its reverse (43004212), we get a palindrome (255404552).

The spelling of 212400340 in words is "two hundred twelve million, four hundred thousand, three hundred forty".