18789450 has 48 divisors (see below), whose sum is σ = 46886880. Its totient is φ = 4979520.

The previous prime is 18789443. The next prime is 18789467. The reversal of 18789450 is 5498781.

18789450 is nontrivially palindromic in base 12.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34077 + ... + 34623.

It is an arithmetic number, because the mean of its divisors is an integer number (976810).

Almost surely, 2^18789450 is an apocalyptic number.

18789450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18789450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23443440).

18789450 is an abundant number, since it is smaller than the sum of its proper divisors (28097430).

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

18789450 is a wasteful number, since it uses less digits than its factorization.

18789450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18789450 is about 4334.6799189790. The cubic root of 18789450 is about 265.8508312453.

The spelling of 18789450 in words is "eighteen million, seven hundred eighty-nine thousand, four hundred fifty".