138232257 has 8 divisors (see below), whose sum is σ = 184367040. Its totient is φ = 92126160.

The previous prime is 138232207. The next prime is 138232271. The reversal of 138232257 is 752232831.

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

It is not a de Polignac number, because 138232257 - 2¹² = 138228161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138232207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9844 + ... + 19322.

It is an arithmetic number, because the mean of its divisors is an integer number (23045880).

Almost surely, 2^138232257 is an apocalyptic number.

It is an amenable number.

138232257 is a deficient number, since it is larger than the sum of its proper divisors (46134783).

138232257 is an equidigital number, since it uses as much as digits as its factorization.

138232257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14343.

The product of its digits is 20160, while the sum is 33.

The square root of 138232257 is about 11757.2214829865. The cubic root of 138232257 is about 517.0546716150.

The spelling of 138232257 in words is "one hundred thirty-eight million, two hundred thirty-two thousand, two hundred fifty-seven".