6138665 has 8 divisors (see below), whose sum is σ = 7933128. Its totient is φ = 4533120.

The previous prime is 6138661. The next prime is 6138667. The reversal of 6138665 is 5668316.

It can be written as a sum of positive squares in 4 ways, for example, as 811801 + 5326864 = 901^2 + 2308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6138665 - 2² = 6138661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6138661) 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 7 ways as a sum of consecutive naturals, for example, 47156 + ... + 47285.

It is an arithmetic number, because the mean of its divisors is an integer number (991641).

Almost surely, 2^6138665 is an apocalyptic number.

6138665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6138665 is a deficient number, since it is larger than the sum of its proper divisors (1794463).

6138665 is a wasteful number, since it uses less digits than its factorization.

6138665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94459.

The product of its digits is 25920, while the sum is 35.

The square root of 6138665 is about 2477.6329429518. The cubic root of 6138665 is about 183.1012508660.

The spelling of 6138665 in words is "six million, one hundred thirty-eight thousand, six hundred sixty-five".