12148309 has 4 divisors (see below), whose sum is σ = 12193740. Its totient is φ = 12102880.

The previous prime is 12148271. The next prime is 12148327. The reversal of 12148309 is 90384121.

It is a happy number.

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 4431025 + 7717284 = 2105^2 + 2778^2 .

It is a cyclic number.

It is not a de Polignac number, because 12148309 - 2¹⁷ = 12017237 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 (12148349) 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, 22312 + ... + 22849.

It is an arithmetic number, because the mean of its divisors is an integer number (3048435).

Almost surely, 2^12148309 is an apocalyptic number.

It is an amenable number.

12148309 is a deficient number, since it is larger than the sum of its proper divisors (45431).

12148309 is an equidigital number, since it uses as much as digits as its factorization.

12148309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45430.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 12148309 is about 3485.4424396337. The cubic root of 12148309 is about 229.8821639619.

The spelling of 12148309 in words is "twelve million, one hundred forty-eight thousand, three hundred nine".