12730538 has 4 divisors (see below), whose sum is σ = 19095810. Its totient is φ = 6365268.

The previous prime is 12730519. The next prime is 12730567. The reversal of 12730538 is 83503721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11950849 + 779689 = 3457^2 + 883^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12730538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3182633 + ... + 3182636.

Almost surely, 2^12730538 is an apocalyptic number.

12730538 is a deficient number, since it is larger than the sum of its proper divisors (6365272).

12730538 is an equidigital number, since it uses as much as digits as its factorization.

12730538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365271.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 12730538 is about 3567.9879484101. The cubic root of 12730538 is about 233.4975094000.

The spelling of 12730538 in words is "twelve million, seven hundred thirty thousand, five hundred thirty-eight".