7138865 has 4 divisors (see below), whose sum is σ = 8566644. Its totient is φ = 5711088.

The previous prime is 7138853. The next prime is 7138867. The reversal of 7138865 is 5688317.

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 2745649 + 4393216 = 1657^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 7138865 - 2⁴ = 7138849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7138867) 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, 713882 + ... + 713891.

It is an arithmetic number, because the mean of its divisors is an integer number (2141661).

Almost surely, 2^7138865 is an apocalyptic number.

It is an amenable number.

7138865 is a deficient number, since it is larger than the sum of its proper divisors (1427779).

7138865 is a wasteful number, since it uses less digits than its factorization.

7138865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427778.

The product of its digits is 40320, while the sum is 38.

The square root of 7138865 is about 2671.8654531993. The cubic root of 7138865 is about 192.5497931572.

The spelling of 7138865 in words is "seven million, one hundred thirty-eight thousand, eight hundred sixty-five".