18200019 has 4 divisors (see below), whose sum is σ = 24266696. Its totient is φ = 12133344.

The previous prime is 18199999. The next prime is 18200033. The reversal of 18200019 is 91000281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91000281 = 3 ⋅30333427.

It is not a de Polignac number, because 18200019 - 2⁹ = 18199507 is a prime.

It is a super-2 number, since 2×18200019² = 662481383200722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18199968 and 18200004.

It is not an unprimeable number, because it can be changed into a prime (18200059) 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, 3033334 + ... + 3033339.

It is an arithmetic number, because the mean of its divisors is an integer number (6066674).

Almost surely, 2^18200019 is an apocalyptic number.

18200019 is a deficient number, since it is larger than the sum of its proper divisors (6066677).

18200019 is an equidigital number, since it uses as much as digits as its factorization.

18200019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6066676.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18200019 is about 4266.1480283741. The cubic root of 18200019 is about 263.0413029630.

The spelling of 18200019 in words is "eighteen million, two hundred thousand, nineteen".