16400217 has 8 divisors (see below), whose sum is σ = 21885696. Its totient is φ = 10924112.

The previous prime is 16400203. The next prime is 16400221. The reversal of 16400217 is 71200461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16400217 - 2⁴ = 16400201 is a prime.

It is a super-3 number, since 3×16400217³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16400193 and 16400202.

It is not an unprimeable number, because it can be changed into a prime (16400017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5383 + ... + 7859.

It is an arithmetic number, because the mean of its divisors is an integer number (2735712).

Almost surely, 2^16400217 is an apocalyptic number.

It is an amenable number.

16400217 is a deficient number, since it is larger than the sum of its proper divisors (5485479).

16400217 is a wasteful number, since it uses less digits than its factorization.

16400217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 16400217 is about 4049.7181383400. The cubic root of 16400217 is about 254.0679391288.

Adding to 16400217 its reverse (71200461), we get a palindrome (87600678).

The spelling of 16400217 in words is "sixteen million, four hundred thousand, two hundred seventeen".