216138759 has 8 divisors (see below), whose sum is σ = 294316800. Its totient is φ = 141026616.

The previous prime is 216138749. The next prime is 216138781. The reversal of 216138759 is 957831612.

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

It is not a de Polignac number, because 216138759 - 2⁴ = 216138743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216138759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216138709) 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, 766309 + ... + 766590.

It is an arithmetic number, because the mean of its divisors is an integer number (36789600).

Almost surely, 2^216138759 is an apocalyptic number.

216138759 is a deficient number, since it is larger than the sum of its proper divisors (78178041).

216138759 is a wasteful number, since it uses less digits than its factorization.

216138759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532949.

The product of its digits is 90720, while the sum is 42.

The square root of 216138759 is about 14701.6583758432. The cubic root of 216138759 is about 600.1284530533.

The spelling of 216138759 in words is "two hundred sixteen million, one hundred thirty-eight thousand, seven hundred fifty-nine".