216740 has 12 divisors (see below), whose sum is σ = 455196. Its totient is φ = 86688.

The previous prime is 216731. The next prime is 216743. The reversal of 216740 is 47612.

216740 is digitally balanced in base 2, 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 61504 + 155236 = 248^2 + 394^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10837 = 216740 / (2 + 1 + 6 + 7 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (216743) 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, 5399 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (37933).

2²¹⁶⁷⁴⁰ is an apocalyptic number.

216740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216740 is an abundant number, since it is smaller than the sum of its proper divisors (238456).

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

216740 is a wasteful number, since it uses less digits than its factorization.

216740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10846 (or 10844 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 216740 is about 465.5534340975. The cubic root of 216740 is about 60.0684404206.

The spelling of 216740 in words is "two hundred sixteen thousand, seven hundred forty".