12138749 has 8 divisors (see below), whose sum is σ = 14135040. Its totient is φ = 10208016.

The previous prime is 12138743. The next prime is 12138761. The reversal of 12138749 is 94783121.

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

It is not a de Polignac number, because 12138749 - 2¹² = 12134653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138743) 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, 15989 + ... + 16730.

It is an arithmetic number, because the mean of its divisors is an integer number (1766880).

Almost surely, 2^12138749 is an apocalyptic number.

It is an amenable number.

12138749 is a deficient number, since it is larger than the sum of its proper divisors (1996291).

12138749 is an equidigital number, since it uses as much as digits as its factorization.

12138749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32779.

The product of its digits is 12096, while the sum is 35.

The square root of 12138749 is about 3484.0707512908. The cubic root of 12138749 is about 229.8218469192.

The spelling of 12138749 in words is "twelve million, one hundred thirty-eight thousand, seven hundred forty-nine".