12539773 has 4 divisors (see below), whose sum is σ = 12546940. Its totient is φ = 12532608.

The previous prime is 12539771. The next prime is 12539777. The reversal of 12539773 is 37793521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37793521 = 79 ⋅478399.

It can be written as a sum of positive squares in 2 ways, for example, as 8922169 + 3617604 = 2987^2 + 1902^2 .

It is a cyclic number.

It is not a de Polignac number, because 12539773 - 2¹ = 12539771 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 (12539771) 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, 973 + ... + 5101.

It is an arithmetic number, because the mean of its divisors is an integer number (3136735).

Almost surely, 2^12539773 is an apocalyptic number.

It is an amenable number.

12539773 is a deficient number, since it is larger than the sum of its proper divisors (7167).

12539773 is an equidigital number, since it uses as much as digits as its factorization.

12539773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7166.

The product of its digits is 39690, while the sum is 37.

The square root of 12539773 is about 3541.1541903735. The cubic root of 12539773 is about 232.3253276251.

It can be divided in two parts, 1253 and 9773, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 12539773 in words is "twelve million, five hundred thirty-nine thousand, seven hundred seventy-three".