12400618 has 4 divisors (see below), whose sum is σ = 18600930. Its totient is φ = 6200308.

The previous prime is 12400613. The next prime is 12400627. The reversal of 12400618 is 81600421.

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., 12369289 + 31329 = 3517^2 + 177^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12400613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3100153 + ... + 3100156.

Almost surely, 2^12400618 is an apocalyptic number.

12400618 is a deficient number, since it is larger than the sum of its proper divisors (6200312).

12400618 is an equidigital number, since it uses as much as digits as its factorization.

12400618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200311.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 12400618 is about 3521.4511213419. The cubic root of 12400618 is about 231.4627505931.

The spelling of 12400618 in words is "twelve million, four hundred thousand, six hundred eighteen".