12615643 has 4 divisors (see below), whose sum is σ = 12853728. Its totient is φ = 12377560.

The previous prime is 12615623. The next prime is 12615653. The reversal of 12615643 is 34651621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34651621 = 71 ⋅488051.

It is a cyclic number.

It is not a de Polignac number, because 12615643 - 2⁵ = 12615611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12615613) 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, 118963 + ... + 119068.

It is an arithmetic number, because the mean of its divisors is an integer number (3213432).

Almost surely, 2^12615643 is an apocalyptic number.

12615643 is a deficient number, since it is larger than the sum of its proper divisors (238085).

12615643 is an equidigital number, since it uses as much as digits as its factorization.

12615643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238084.

The product of its digits is 4320, while the sum is 28.

The square root of 12615643 is about 3551.8506443824. The cubic root of 12615643 is about 232.7929355780.

The spelling of 12615643 in words is "twelve million, six hundred fifteen thousand, six hundred forty-three".