18423636 has 96 divisors (see below), whose sum is σ = 54362112. Its totient is φ = 4717440.

The previous prime is 18423611. The next prime is 18423649. The reversal of 18423636 is 63632481.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 18423597 and 18423606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117270 + ... + 117426.

It is an arithmetic number, because the mean of its divisors is an integer number (566272).

Almost surely, 2^18423636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18423636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27181056).

18423636 is an abundant number, since it is smaller than the sum of its proper divisors (35938476).

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

18423636 is a wasteful number, since it uses less digits than its factorization.

18423636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 307 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 18423636 is about 4292.2763191575. The cubic root of 18423636 is about 264.1142182537.

The spelling of 18423636 in words is "eighteen million, four hundred twenty-three thousand, six hundred thirty-six".