216237340 has 48 divisors (see below), whose sum is σ = 512477280. Its totient is φ = 75918080.

The previous prime is 216237323. The next prime is 216237353. The reversal of 216237340 is 43732612.

It is a junction number, because it is equal to n+sod(n) for n = 216237299 and 216237308.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 10567 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (10676610).

Almost surely, 2^216237340 is an apocalyptic number.

216237340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216237340 is an abundant number, since it is smaller than the sum of its proper divisors (296239940).

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

216237340 is a wasteful number, since it uses less digits than its factorization.

216237340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33942 (or 33940 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 216237340 is about 14705.0107106387. The cubic root of 216237340 is about 600.2196788181.

Adding to 216237340 its reverse (43732612), we get a palindrome (259969952).

The spelling of 216237340 in words is "two hundred sixteen million, two hundred thirty-seven thousand, three hundred forty".