216838733 has 16 divisors (see below), whose sum is σ = 231038976. Its totient is φ = 203076720.

The previous prime is 216838729. The next prime is 216838789. The reversal of 216838733 is 337838612.

It is a cyclic number.

It is not a de Polignac number, because 216838733 - 2² = 216838729 is a prime.

It is a super-2 number, since 2×216838733² = 94038072258090578, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216838033) 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, 343328 + ... + 343958.

It is an arithmetic number, because the mean of its divisors is an integer number (14439936).

Almost surely, 2^216838733 is an apocalyptic number.

216838733 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216838733 is a deficient number, since it is larger than the sum of its proper divisors (14200243).

216838733 is a wasteful number, since it uses less digits than its factorization.

216838733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944.

The product of its digits is 145152, while the sum is 41.

The square root of 216838733 is about 14725.4450866519. The cubic root of 216838733 is about 600.7756016012.

The spelling of 216838733 in words is "two hundred sixteen million, eight hundred thirty-eight thousand, seven hundred thirty-three".