18420195 has 8 divisors (see below), whose sum is σ = 29472336. Its totient is φ = 9824096.

The previous prime is 18420161. The next prime is 18420209. The reversal of 18420195 is 59102481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18420195 - 2⁷ = 18420067 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 613992 + ... + 614021.

It is an arithmetic number, because the mean of its divisors is an integer number (3684042).

Almost surely, 2^18420195 is an apocalyptic number.

18420195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18420195 is a deficient number, since it is larger than the sum of its proper divisors (11052141).

18420195 is a wasteful number, since it uses less digits than its factorization.

18420195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228021.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 18420195 is about 4291.8754641765. The cubic root of 18420195 is about 264.0977742754.

The spelling of 18420195 in words is "eighteen million, four hundred twenty thousand, one hundred ninety-five".