12730405 has 8 divisors (see below), whose sum is σ = 15689592. Its totient is φ = 9908928.

The previous prime is 12730381. The next prime is 12730409. The reversal of 12730405 is 50403721.

It can be written as a sum of positive squares in 4 ways, for example, as 7717284 + 5013121 = 2778^2 + 2239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12730405 - 2¹⁷ = 12599333 is a prime.

It is a super-2 number, since 2×12730405² = 324126422928050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12730409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34222 + ... + 34591.

It is an arithmetic number, because the mean of its divisors is an integer number (1961199).

Almost surely, 2^12730405 is an apocalyptic number.

It is an amenable number.

12730405 is a deficient number, since it is larger than the sum of its proper divisors (2959187).

12730405 is an equidigital number, since it uses as much as digits as its factorization.

12730405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68855.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 12730405 is about 3567.9693104061. The cubic root of 12730405 is about 233.4966962561.

The spelling of 12730405 in words is "twelve million, seven hundred thirty thousand, four hundred five".