19845118 has 4 divisors (see below), whose sum is σ = 29767680. Its totient is φ = 9922558.

The previous prime is 19845109. The next prime is 19845121. The reversal of 19845118 is 81154891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81154891 = 379 ⋅214129.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4961278 + ... + 4961281.

It is an arithmetic number, because the mean of its divisors is an integer number (7441920).

Almost surely, 2^19845118 is an apocalyptic number.

19845118 is a deficient number, since it is larger than the sum of its proper divisors (9922562).

19845118 is an equidigital number, since it uses as much as digits as its factorization.

19845118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9922561.

The product of its digits is 11520, while the sum is 37.

The square root of 19845118 is about 4454.7859656778. The cubic root of 19845118 is about 270.7392543822.

The spelling of 19845118 in words is "nineteen million, eight hundred forty-five thousand, one hundred eighteen".