16840217 has 16 divisors (see below), whose sum is σ = 18788112. Its totient is φ = 15022080.

The previous prime is 16840171. The next prime is 16840231. The reversal of 16840217 is 71204861.

It can be written as a sum of positive squares in 8 ways, for example, as 38416 + 16801801 = 196^2 + 4099^2 .

It is a cyclic number.

It is not a de Polignac number, because 16840217 - 2¹² = 16836121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16840217.

It is not an unprimeable number, because it can be changed into a prime (16840237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25463 + ... + 26115.

It is an arithmetic number, because the mean of its divisors is an integer number (1174257).

Almost surely, 2^16840217 is an apocalyptic number.

16840217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16840217 is a deficient number, since it is larger than the sum of its proper divisors (1947895).

16840217 is a wasteful number, since it uses less digits than its factorization.

16840217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 16840217 is about 4103.6833454837. The cubic root of 16840217 is about 256.3200393914.

The spelling of 16840217 in words is "sixteen million, eight hundred forty thousand, two hundred seventeen".