18420193 has 24 divisors (see below), whose sum is σ = 21450240. Its totient is φ = 15787200.

The previous prime is 18420161. The next prime is 18420209. The reversal of 18420193 is 39102481.

It is a happy number.

It is not a de Polignac number, because 18420193 - 2⁵ = 18420161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18426193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 233128 + ... + 233206.

It is an arithmetic number, because the mean of its divisors is an integer number (893760).

Almost surely, 2^18420193 is an apocalyptic number.

It is an amenable number.

18420193 is a deficient number, since it is larger than the sum of its proper divisors (3030047).

18420193 is a wasteful number, since it uses less digits than its factorization.

18420193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18420193 is about 4291.8752311781. The cubic root of 18420193 is about 264.0977647171.

The spelling of 18420193 in words is "eighteen million, four hundred twenty thousand, one hundred ninety-three".