18645004 has 48 divisors (see below), whose sum is σ = 39755520. Its totient is φ = 7473600.

The previous prime is 18644993. The next prime is 18645007. The reversal of 18645004 is 40054681.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (18645007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53559 + ... + 53905.

It is an arithmetic number, because the mean of its divisors is an integer number (828240).

Almost surely, 2^18645004 is an apocalyptic number.

18645004 is a gapful number since it is divisible by the number (14) 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 18645004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19877760).

18645004 is an abundant number, since it is smaller than the sum of its proper divisors (21110516).

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

18645004 is a wasteful number, since it uses less digits than its factorization.

18645004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 18645004 is about 4317.9861046557. The cubic root of 18645004 is about 265.1678253415.

Adding to 18645004 its reverse (40054681), we get a palindrome (58699685).

The spelling of 18645004 in words is "eighteen million, six hundred forty-five thousand, four".