238216691 has 8 divisors (see below), whose sum is σ = 242791824. Its totient is φ = 233671680.

The previous prime is 238216687. The next prime is 238216703. The reversal of 238216691 is 196612832.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 238216691 - 2² = 238216687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238216621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8771 + ... + 23523.

It is an arithmetic number, because the mean of its divisors is an integer number (30348978).

Almost surely, 2^238216691 is an apocalyptic number.

238216691 is a deficient number, since it is larger than the sum of its proper divisors (4575133).

238216691 is a wasteful number, since it uses less digits than its factorization.

238216691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15061.

The product of its digits is 31104, while the sum is 38.

The square root of 238216691 is about 15434.2700183715. The cubic root of 238216691 is about 619.9034631173.

The spelling of 238216691 in words is "two hundred thirty-eight million, two hundred sixteen thousand, six hundred ninety-one".