18698443 has 4 divisors (see below), whose sum is σ = 18747648. Its totient is φ = 18649240.

The previous prime is 18698441. The next prime is 18698461. The reversal of 18698443 is 34489681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34489681 = 47 ⋅733823.

It is a cyclic number.

It is not a de Polignac number, because 18698443 - 2¹ = 18698441 is a prime.

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 18698443.

It is not an unprimeable number, because it can be changed into a prime (18698441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24028 + ... + 24793.

It is an arithmetic number, because the mean of its divisors is an integer number (4686912).

Almost surely, 2^18698443 is an apocalyptic number.

18698443 is a deficient number, since it is larger than the sum of its proper divisors (49205).

18698443 is an equidigital number, since it uses as much as digits as its factorization.

18698443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49204.

The product of its digits is 165888, while the sum is 43.

The square root of 18698443 is about 4324.1696312703. The cubic root of 18698443 is about 265.4209188236.

The spelling of 18698443 in words is "eighteen million, six hundred ninety-eight thousand, four hundred forty-three".