6139729 has 4 divisors (see below), whose sum is σ = 6157476. Its totient is φ = 6121984.

The previous prime is 6139723. The next prime is 6139733. The reversal of 6139729 is 9279316.

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 1896129 + 4243600 = 1377^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 6139729 - 2⁵ = 6139697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6139723) 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, 8344 + ... + 9049.

It is an arithmetic number, because the mean of its divisors is an integer number (1539369).

Almost surely, 2^6139729 is an apocalyptic number.

It is an amenable number.

6139729 is a deficient number, since it is larger than the sum of its proper divisors (17747).

6139729 is a wasteful number, since it uses less digits than its factorization.

6139729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17746.

The product of its digits is 20412, while the sum is 37.

The square root of 6139729 is about 2477.8476547197. The cubic root of 6139729 is about 183.1118290876. Note that the first 3 decimals are identical.

The spelling of 6139729 in words is "six million, one hundred thirty-nine thousand, seven hundred twenty-nine".