216486399 has 16 divisors (see below), whose sum is σ = 308995200. Its totient is φ = 134408736.

The previous prime is 216486379. The next prime is 216486401. The reversal of 216486399 is 993684612.

It is not a de Polignac number, because 216486399 - 2⁵ = 216486367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216486349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28824 + ... + 35549.

It is an arithmetic number, because the mean of its divisors is an integer number (19312200).

Almost surely, 2^216486399 is an apocalyptic number.

216486399 is a deficient number, since it is larger than the sum of its proper divisors (92508801).

216486399 is a wasteful number, since it uses less digits than its factorization.

216486399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64454.

The product of its digits is 559872, while the sum is 48.

The square root of 216486399 is about 14713.4767815088. The cubic root of 216486399 is about 600.4500318123.

The spelling of 216486399 in words is "two hundred sixteen million, four hundred eighty-six thousand, three hundred ninety-nine".