238707257 has 4 divisors (see below), whose sum is σ = 239176740. Its totient is φ = 238237776.

The previous prime is 238707247. The next prime is 238707277. The reversal of 238707257 is 752707832.

238707257 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.

It can be written as a sum of positive squares in 2 ways, for example, as 105904681 + 132802576 = 10291^2 + 11524^2 .

It is a cyclic number.

It is not a de Polignac number, because 238707257 - 2⁶ = 238707193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238707247) 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, 233978 + ... + 234995.

It is an arithmetic number, because the mean of its divisors is an integer number (59794185).

Almost surely, 2^238707257 is an apocalyptic number.

It is an amenable number.

238707257 is a deficient number, since it is larger than the sum of its proper divisors (469483).

238707257 is an equidigital number, since it uses as much as digits as its factorization.

238707257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469482.

The product of its (nonzero) digits is 164640, while the sum is 41.

The square root of 238707257 is about 15450.1539474531. The cubic root of 238707257 is about 620.3286992752.

The spelling of 238707257 in words is "two hundred thirty-eight million, seven hundred seven thousand, two hundred fifty-seven".