7138709 has 4 divisors (see below), whose sum is σ = 7144320. Its totient is φ = 7133100.

The previous prime is 7138697. The next prime is 7138723. The reversal of 7138709 is 9078317.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7138709 - 2⁴ = 7138693 is a prime.

It is a super-2 number, since 2×7138709² = 101922332373362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138799) 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, 122 + ... + 3780.

It is an arithmetic number, because the mean of its divisors is an integer number (1786080).

Almost surely, 2^7138709 is an apocalyptic number.

It is an amenable number.

7138709 is a deficient number, since it is larger than the sum of its proper divisors (5611).

7138709 is a wasteful number, since it uses less digits than its factorization.

7138709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 7138709 is about 2671.8362599531. The cubic root of 7138709 is about 192.5483906006.

The spelling of 7138709 in words is "seven million, one hundred thirty-eight thousand, seven hundred nine".