216043340 has 24 divisors (see below), whose sum is σ = 468327552. Its totient is φ = 83629440.

The previous prime is 216043337. The next prime is 216043351. The reversal of 216043340 is 43340612.

It is a happy number.

It is an unprimeable number.

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, 173609 + ... + 174848.

It is an arithmetic number, because the mean of its divisors is an integer number (19513648).

Almost surely, 2^216043340 is an apocalyptic number.

216043340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216043340 is an abundant number, since it is smaller than the sum of its proper divisors (252284212).

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

216043340 is a wasteful number, since it uses less digits than its factorization.

216043340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348497 (or 348495 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 216043340 is about 14698.4128394871. The cubic root of 216043340 is about 600.0401269460.

Adding to 216043340 its reverse (43340612), we get a palindrome (259383952).

The spelling of 216043340 in words is "two hundred sixteen million, forty-three thousand, three hundred forty".