239138993 has 4 divisors (see below), whose sum is σ = 239249268. Its totient is φ = 239028720.

The previous prime is 239138989. The next prime is 239139031. The reversal of 239138993 is 399831932.

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 213656689 + 25482304 = 14617^2 + 5048^2 .

It is a cyclic number.

It is not a de Polignac number, because 239138993 - 2² = 239138989 is a prime.

It is a super-3 number, since 3×239138993³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239128993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51818 + ... + 56243.

It is an arithmetic number, because the mean of its divisors is an integer number (59812317).

Almost surely, 2^239138993 is an apocalyptic number.

It is an amenable number.

239138993 is a deficient number, since it is larger than the sum of its proper divisors (110275).

239138993 is a wasteful number, since it uses less digits than its factorization.

239138993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110274.

The product of its digits is 314928, while the sum is 47.

The square root of 239138993 is about 15464.1195352338. The cubic root of 239138993 is about 620.7024582387.

The spelling of 239138993 in words is "two hundred thirty-nine million, one hundred thirty-eight thousand, nine hundred ninety-three".