12403239 has 4 divisors (see below), whose sum is σ = 16537656. Its totient is φ = 8268824.

The previous prime is 12403199. The next prime is 12403243. The reversal of 12403239 is 93230421.

12403239 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93230421 = 3 ⋅31076807.

It is a cyclic number.

It is not a de Polignac number, because 12403239 - 2¹² = 12399143 is a prime.

It is a super-2 number, since 2×12403239² = 307680675382242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403249) 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, 2067204 + ... + 2067209.

It is an arithmetic number, because the mean of its divisors is an integer number (4134414).

Almost surely, 2^12403239 is an apocalyptic number.

12403239 is a deficient number, since it is larger than the sum of its proper divisors (4134417).

12403239 is an equidigital number, since it uses as much as digits as its factorization.

12403239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134416.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 12403239 is about 3521.8232493980. The cubic root of 12403239 is about 231.4790568001.

The spelling of 12403239 in words is "twelve million, four hundred three thousand, two hundred thirty-nine".