18993395 has 8 divisors (see below), whose sum is σ = 23408304. Its totient is φ = 14783904.

The previous prime is 18993391. The next prime is 18993397. The reversal of 18993395 is 59339981.

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 18993395 - 2² = 18993391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18993391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51149 + ... + 51518.

It is an arithmetic number, because the mean of its divisors is an integer number (2926038).

Almost surely, 2^18993395 is an apocalyptic number.

18993395 is a deficient number, since it is larger than the sum of its proper divisors (4414909).

18993395 is a wasteful number, since it uses less digits than its factorization.

18993395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102709.

The product of its digits is 262440, while the sum is 47.

The square root of 18993395 is about 4358.1412322227. The cubic root of 18993395 is about 266.8092405992.

The spelling of 18993395 in words is "eighteen million, nine hundred ninety-three thousand, three hundred ninety-five".