12402539 has 4 divisors (see below), whose sum is σ = 12523056. Its totient is φ = 12282024.

The previous prime is 12402527. The next prime is 12402547. The reversal of 12402539 is 93520421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93520421 = 3163 ⋅29567.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12402539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12402569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60104 + ... + 60309.

It is an arithmetic number, because the mean of its divisors is an integer number (3130764).

Almost surely, 2^12402539 is an apocalyptic number.

12402539 is a deficient number, since it is larger than the sum of its proper divisors (120517).

12402539 is a wasteful number, since it uses less digits than its factorization.

12402539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120516.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 12402539 is about 3521.7238676535. The cubic root of 12402539 is about 231.4747020670.

The spelling of 12402539 in words is "twelve million, four hundred two thousand, five hundred thirty-nine".