18443436 has 48 divisors (see below), whose sum is σ = 49714560. Its totient is φ = 5259520.

The previous prime is 18443423. The next prime is 18443441. The reversal of 18443436 is 63434481.

It is a happy number.

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 = 18443397 and 18443406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1866 + ... + 6353.

It is an arithmetic number, because the mean of its divisors is an integer number (1035720).

Almost surely, 2^18443436 is an apocalyptic number.

It is an amenable number.

18443436 is an abundant number, since it is smaller than the sum of its proper divisors (31271124).

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

18443436 is a wasteful number, since it uses less digits than its factorization.

18443436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8254 (or 8252 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 18443436 is about 4294.5821682674. The cubic root of 18443436 is about 264.2087994620.

The spelling of 18443436 in words is "eighteen million, four hundred forty-three thousand, four hundred thirty-six".