12653618 has 4 divisors (see below), whose sum is σ = 18980430. Its totient is φ = 6326808.

The previous prime is 12653617. The next prime is 12653621. The reversal of 12653618 is 81635621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81635621 = 911 ⋅89611.

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 1369 = 3557^2 + 37^2 .

It is a super-2 number, since 2×12653618² = 320228096979848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12653617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3163403 + ... + 3163406.

Almost surely, 2^12653618 is an apocalyptic number.

12653618 is a deficient number, since it is larger than the sum of its proper divisors (6326812).

12653618 is an equidigital number, since it uses as much as digits as its factorization.

12653618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6326811.

The product of its digits is 8640, while the sum is 32.

The square root of 12653618 is about 3557.1924322420. The cubic root of 12653618 is about 233.0262822864.

The spelling of 12653618 in words is "twelve million, six hundred fifty-three thousand, six hundred eighteen".