18420395 has 8 divisors (see below), whose sum is σ = 25262304. Its totient is φ = 12631104.

The previous prime is 18420379. The next prime is 18420407. The reversal of 18420395 is 59302481.

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 18420395 - 2⁴ = 18420379 is a prime.

It is a Duffinian number.

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, 263114 + ... + 263183.

It is an arithmetic number, because the mean of its divisors is an integer number (3157788).

Almost surely, 2^18420395 is an apocalyptic number.

18420395 is a deficient number, since it is larger than the sum of its proper divisors (6841909).

18420395 is an equidigital number, since it uses as much as digits as its factorization.

18420395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526309.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 18420395 is about 4291.8987639505. The cubic root of 18420395 is about 264.0987300989.

The spelling of 18420395 in words is "eighteen million, four hundred twenty thousand, three hundred ninety-five".