216156340 has 12 divisors (see below), whose sum is σ = 453928356. Its totient is φ = 86462528.

The previous prime is 216156329. The next prime is 216156341. The reversal of 216156340 is 43651612.

216156340 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 25826724 + 190329616 = 5082^2 + 13796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216156299 and 216156308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216156341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5403889 + ... + 5403928.

It is an arithmetic number, because the mean of its divisors is an integer number (37827363).

Almost surely, 2^216156340 is an apocalyptic number.

216156340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216156340 is an abundant number, since it is smaller than the sum of its proper divisors (237772016).

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

216156340 is a wasteful number, since it uses less digits than its factorization.

216156340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10807826 (or 10807824 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 216156340 is about 14702.2562894271. The cubic root of 216156340 is about 600.1447243479.

The spelling of 216156340 in words is "two hundred sixteen million, one hundred fifty-six thousand, three hundred forty".