12399523 has 4 divisors (see below), whose sum is σ = 12687928. Its totient is φ = 12111120.

The previous prime is 12399503. The next prime is 12399539. The reversal of 12399523 is 32599321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32599321 = 31 ⋅1051591.

It is a cyclic number.

It is not a de Polignac number, because 12399523 - 2⁹ = 12399011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12399503) 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, 144138 + ... + 144223.

It is an arithmetic number, because the mean of its divisors is an integer number (3171982).

Almost surely, 2^12399523 is an apocalyptic number.

12399523 is a deficient number, since it is larger than the sum of its proper divisors (288405).

12399523 is an equidigital number, since it uses as much as digits as its factorization.

12399523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288404.

The product of its digits is 14580, while the sum is 34.

The square root of 12399523 is about 3521.2956422317. The cubic root of 12399523 is about 231.4559375140.

The spelling of 12399523 in words is "twelve million, three hundred ninety-nine thousand, five hundred twenty-three".