12423618 has 28 divisors (see below), whose sum is σ = 27943638. Its totient is φ = 4140720.

The previous prime is 12423613. The next prime is 12423623. The reversal of 12423618 is 81632421.

12423618 is a `hidden beast` number, since 1 + 2 + 42 + 3 + 618 = 666.

12423618 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12423613) and next prime (12423623).

It can be written as a sum of positive squares in only one way, i.e., 10673289 + 1750329 = 3267^2 + 1323^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12423591 and 12423600.

It is not an unprimeable number, because it can be changed into a prime (12423613) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 2803 + ... + 5718.

Almost surely, 2^12423618 is an apocalyptic number.

12423618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12423618 is an abundant number, since it is smaller than the sum of its proper divisors (15520020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12423618 is an frugal number, since it uses more digits than its factorization.

12423618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8541 (or 8526 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 12423618 is about 3524.7153076525. The cubic root of 12423618 is about 231.6057637697.

It can be divided in two parts, 12423 and 618, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 12423618 in words is "twelve million, four hundred twenty-three thousand, six hundred eighteen".