18423612 has 60 divisors (see below), whose sum is σ = 48726216. Its totient is φ = 6069600.

The previous prime is 18423611. The next prime is 18423649. The reversal of 18423612 is 21632481.

18423612 is a `hidden beast` number, since 1 + 8 + 42 + 3 + 612 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18423611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32443 + ... + 33005.

Almost surely, 2^18423612 is an apocalyptic number.

18423612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18423612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24363108).

18423612 is an abundant number, since it is smaller than the sum of its proper divisors (30302604).

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

18423612 is a wasteful number, since it uses less digits than its factorization.

18423612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 669 counting only the distinct ones).

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

The square root of 18423612 is about 4292.2735234372. The cubic root of 18423612 is about 264.1141035687.

The spelling of 18423612 in words is "eighteen million, four hundred twenty-three thousand, six hundred twelve".