138143233 has 4 divisors (see below), whose sum is σ = 138866688. Its totient is φ = 137419780.

The previous prime is 138143231. The next prime is 138143251. The reversal of 138143233 is 332341831.

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 not a de Polignac number, because 138143233 - 2¹ = 138143231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138143231) 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, 361441 + ... + 361822.

It is an arithmetic number, because the mean of its divisors is an integer number (34716672).

Almost surely, 2^138143233 is an apocalyptic number.

It is an amenable number.

138143233 is a deficient number, since it is larger than the sum of its proper divisors (723455).

138143233 is an equidigital number, since it uses as much as digits as its factorization.

138143233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723454.

The product of its digits is 5184, while the sum is 28.

The square root of 138143233 is about 11753.4349447300. The cubic root of 138143233 is about 516.9436503501.

The spelling of 138143233 in words is "one hundred thirty-eight million, one hundred forty-three thousand, two hundred thirty-three".