12128739 has 8 divisors (see below), whose sum is σ = 18481920. Its totient is φ = 6930696.

The previous prime is 12128729. The next prime is 12128741. The reversal of 12128739 is 93782121.

12128739 is digitally balanced in base 2, base 4 and base 8, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12128739 - 2⁸ = 12128483 is a prime.

12128739 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (12128729) 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, 288759 + ... + 288800.

It is an arithmetic number, because the mean of its divisors is an integer number (2310240).

Almost surely, 2^12128739 is an apocalyptic number.

12128739 is a deficient number, since it is larger than the sum of its proper divisors (6353181).

12128739 is an equidigital number, since it uses as much as digits as its factorization.

12128739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577569.

The product of its digits is 6048, while the sum is 33.

The square root of 12128739 is about 3482.6339170231. The cubic root of 12128739 is about 229.7586567355.

The spelling of 12128739 in words is "twelve million, one hundred twenty-eight thousand, seven hundred thirty-nine".