7138239 has 4 divisors (see below), whose sum is σ = 9517656. Its totient is φ = 4758824.

The previous prime is 7138237. The next prime is 7138273. The reversal of 7138239 is 9328317.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7138239 - 2¹ = 7138237 is a prime.

It is a super-2 number, since 2×7138239² = 101908912042242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189704 + ... + 1189709.

It is an arithmetic number, because the mean of its divisors is an integer number (2379414).

Almost surely, 2^7138239 is an apocalyptic number.

7138239 is a deficient number, since it is larger than the sum of its proper divisors (2379417).

7138239 is a wasteful number, since it uses less digits than its factorization.

7138239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379416.

The product of its digits is 9072, while the sum is 33.

The square root of 7138239 is about 2671.7483040137. The cubic root of 7138239 is about 192.5441648258.

The spelling of 7138239 in words is "seven million, one hundred thirty-eight thousand, two hundred thirty-nine".