216424999 has 8 divisors (see below), whose sum is σ = 255872160. Its totient is φ = 179110176.

The previous prime is 216424997. The next prime is 216425017. The reversal of 216424999 is 999424612.

It is a happy number.

216424999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 216424999 - 2¹ = 216424997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216424993) 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, 532864 + ... + 533269.

It is an arithmetic number, because the mean of its divisors is an integer number (31984020).

Almost surely, 2^216424999 is an apocalyptic number.

216424999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

216424999 is a deficient number, since it is larger than the sum of its proper divisors (39447161).

216424999 is a wasteful number, since it uses less digits than its factorization.

216424999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066169.

The product of its digits is 279936, while the sum is 46.

The square root of 216424999 is about 14711.3901110670. The cubic root of 216424999 is about 600.3932597809.

The spelling of 216424999 in words is "two hundred sixteen million, four hundred twenty-four thousand, nine hundred ninety-nine".