238128569 has 4 divisors (see below), whose sum is σ = 272146944. Its totient is φ = 204110196.

The previous prime is 238128557. The next prime is 238128589. The reversal of 238128569 is 965821832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238128569 is a prime.

It is a super-2 number, since 2×238128569² = 113410430747975522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (238128529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17009177 + ... + 17009190.

It is an arithmetic number, because the mean of its divisors is an integer number (68036736).

Almost surely, 2^238128569 is an apocalyptic number.

It is an amenable number.

238128569 is a deficient number, since it is larger than the sum of its proper divisors (34018375).

238128569 is an equidigital number, since it uses as much as digits as its factorization.

238128569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34018374.

The product of its digits is 207360, while the sum is 44.

The square root of 238128569 is about 15431.4150031681. The cubic root of 238128569 is about 619.8270146954.

The spelling of 238128569 in words is "two hundred thirty-eight million, one hundred twenty-eight thousand, five hundred sixty-nine".