238640197 has 4 divisors (see below), whose sum is σ = 243717696. Its totient is φ = 233562700.

The previous prime is 238640173. The next prime is 238640221. The reversal of 238640197 is 791046832.

238640197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (238640173) and next prime (238640221).

It is a cyclic number.

It is not a de Polignac number, because 238640197 - 2¹¹ = 238638149 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238640137) 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, 2538679 + ... + 2538772.

It is an arithmetic number, because the mean of its divisors is an integer number (60929424).

Almost surely, 2^238640197 is an apocalyptic number.

It is an amenable number.

238640197 is a deficient number, since it is larger than the sum of its proper divisors (5077499).

238640197 is an equidigital number, since it uses as much as digits as its factorization.

238640197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077498.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 238640197 is about 15447.9835901000. The cubic root of 238640197 is about 620.2706042132.

The spelling of 238640197 in words is "two hundred thirty-eight million, six hundred forty thousand, one hundred ninety-seven".