6138921 has 8 divisors (see below), whose sum is σ = 8666784. Its totient is φ = 3851840.

The previous prime is 6138901. The next prime is 6138947. The reversal of 6138921 is 1298316.

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

It is a cyclic number.

It is not a de Polignac number, because 6138921 - 2⁷ = 6138793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6138901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60135 + ... + 60236.

It is an arithmetic number, because the mean of its divisors is an integer number (1083348).

Almost surely, 2^6138921 is an apocalyptic number.

It is an amenable number.

6138921 is a deficient number, since it is larger than the sum of its proper divisors (2527863).

6138921 is a wasteful number, since it uses less digits than its factorization.

6138921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120391.

The product of its digits is 2592, while the sum is 30.

The square root of 6138921 is about 2477.6846046259. The cubic root of 6138921 is about 183.1037961137.

The spelling of 6138921 in words is "six million, one hundred thirty-eight thousand, nine hundred twenty-one".