18004459 has 16 divisors (see below), whose sum is σ = 20837376. Its totient is φ = 15400800.

The previous prime is 18004417. The next prime is 18004463. The reversal of 18004459 is 95440081.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18004459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18004459.

It is not an unprimeable number, because it can be changed into a prime (18004759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11904 + ... + 13330.

It is an arithmetic number, because the mean of its divisors is an integer number (1302336).

Almost surely, 2^18004459 is an apocalyptic number.

18004459 is a deficient number, since it is larger than the sum of its proper divisors (2832917).

18004459 is a wasteful number, since it uses less digits than its factorization.

18004459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 18004459 is about 4243.1661527685. The cubic root of 18004459 is about 262.0957781636.

The spelling of 18004459 in words is "eighteen million, four thousand, four hundred fifty-nine".