216138007 has 8 divisors (see below), whose sum is σ = 221331456. Its totient is φ = 210969432.

The previous prime is 216138001. The next prime is 216138011. The reversal of 216138007 is 700831612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216138007 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 (216138001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11998 + ... + 24004.

It is an arithmetic number, because the mean of its divisors is an integer number (27666432).

Almost surely, 2^216138007 is an apocalyptic number.

216138007 is a deficient number, since it is larger than the sum of its proper divisors (5193449).

216138007 is a wasteful number, since it uses less digits than its factorization.

216138007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12437.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 216138007 is about 14701.6328004749. The cubic root of 216138007 is about 600.1277570542.

Adding to 216138007 its reverse (700831612), we get a palindrome (916969619).

The spelling of 216138007 in words is "two hundred sixteen million, one hundred thirty-eight thousand, seven".