17998794 has 64 divisors (see below), whose sum is σ = 44138880. Its totient is φ = 5391360.

The previous prime is 17998793. The next prime is 17998819. The reversal of 17998794 is 49789971.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 17998794.

It is not an unprimeable number, because it can be changed into a prime (17998793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93162 + ... + 93354.

It is an arithmetic number, because the mean of its divisors is an integer number (689670).

Almost surely, 2^17998794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17998794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22069440).

17998794 is an abundant number, since it is smaller than the sum of its proper divisors (26140086).

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

17998794 is a wasteful number, since it uses less digits than its factorization.

17998794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 366 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 17998794 is about 4242.4985562755. The cubic root of 17998794 is about 262.0682863011.

It can be divided in two parts, 179987 and 94, that added together give a palindrome (180081).

The spelling of 17998794 in words is "seventeen million, nine hundred ninety-eight thousand, seven hundred ninety-four".