18698394 has 128 divisors (see below), whose sum is σ = 49029120. Its totient is φ = 4665600.

The previous prime is 18698389. The next prime is 18698401. The reversal of 18698394 is 49389681.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 505344 + ... + 505380.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^18698394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18698394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24514560).

18698394 is an abundant number, since it is smaller than the sum of its proper divisors (30330726).

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

18698394 is a wasteful number, since it uses less digits than its factorization.

18698394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116.

The product of its digits is 373248, while the sum is 48.

The square root of 18698394 is about 4324.1639654389. The cubic root of 18698394 is about 265.4206869748.

It can be divided in two parts, 186 and 98394, that multiplied together give a square (18301284 = 4278²).

The spelling of 18698394 in words is "eighteen million, six hundred ninety-eight thousand, three hundred ninety-four".